1. Curium 2. xenon 3.the element with valance electron 4 and 2 is Tin and lead 4. Nickel . if when n=3 , the number of electrons is 18 , then the total number of electrons will be 28 ; because there will be 2 electrons in n=1 and 8 electrons when n=2 using the equation .Thus atomic number will be 28. The element with atomic number 28 is Nickel
5. Deuterium .Its an isotope of hydrogen. it has only one neutron
1) Answer is: Silicon is in the same group and also has 4 valence electrons. Carbon is a chemical element with symbol C and atomic number 6, which means it has 6 protons and six electrons. Four valence electrons are in 2s and 2p orbitals. Electron configuration of carbon atom: ₆C 1s² 2s² 2p². Silicon (Si) is element with atomic number 14 (14 protons and 14 electrons). Four valence electrons are in 3s and 3p orbitals. Electron configuration of silicon atom: ₁₄Si 1s² 2s² 2p⁶ 3s² 3p². 2) Answer is: covalent bond. When the electronegativity difference is greater, the bond polarity is increasing. Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons. Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom. For example: Δχ(P-S) = 2.6 – 2.2 = 0.4; electronegativity difference between phosphorus and sulfur is 0.4, this bond is covalent. 3) Answer is: hydrogen has 1 valence electron. Hydrogen (H) has atomic number 1, it means it has one proton and and one electron. Electron configuration for hydrogen atom: ₁H 1s¹. Valence electron in hydrogen atom is in 1s atomic orbital. The atomic number (Z) determines total number of protons and uniquely identifies a chemical element, also the atomic number is equal to the number of electrons. 4) Answer is: wood. Different forms of the same element that have different properties because of different atom arrangements are called allotropes. Carbon has many allotropes, but two most important are graphite and diamomd. Graphite has sp2 and diamond has sp3 hybridization of carbon atoms, because of that graphite conduct electricity and diamond not. In diamond carbon atoms are arranged in the face centered cubic crystal structure called a diamond lattice. Diamond has very strong covalent bonds between carbon atoms and because of that it has the highest hardness and thermal conductivity of any bulk substance. 5) Answers are: Coke is a residue that remains after volatile products distill off from the heating of coal. Pollution is a problem related to burning soft coal. Coal undergoes decomposition when heated to high temperature in the absence of air. Coke is a fuel made by heating coal in the absence of air. It is the solid carbonaceous material derived from destructive distillation. Anthracite is the highest rank of coal. It is a hard, brittle and black lustrous coal. Most often greenhouse gases are carbon dioxide and methane. They come from burning multiple substances: coal, petroleum, natural gas. Carbon dioxide (CO₂) and energy (heat) is produced by combustion of fossil fuels, that energy is used for producing electricity (the heat energy of combustion is converted into mechanical energy). For example, coal power plants use coal to heat water into steam, that steam. 6) Answer is: 1s22s22p2. Carbon is a chemical element with symbol C and atomic number 6, which means it has 6 protons and six electrons. Four valence electrons are in 2s and 2p orbitals. Electron configuration of carbon atom: ₆C 1s² 2s² 2p². The atomic number (Z) determines total number of protons and uniquely identifies a chemical element, also the atomic number is equal to the number of electrons. 7) Answer is: covalent. For example chemical compound CCl₄ (carbon tetrachloride). There are four single covalent bonds between one carbon atom and four chlorine atoms. Carbon has sp3 hybridization (hybridize one s-orbital and three p-orbitals) and four chlorine atoms are positioned symmetrically as corners in a tetrahedral configuration. Because of symmetrical geometry, carbon tetrachloride is non-polar molecule. 8) Answers are: Carbon dioxide is not an organic compound. Carbon chains can form branches and cross-links. Carbon compounds can be rings. Carbon monoxide (CO) and carbon dioxide (CO₂) are inorganic compounds. Carbon form rings, for example benzene. All of the carbon-carbon bonds in benzene are identical. All six carbon atoms in bezene are sp2 hybridized. All of the carbon-carbon bonds have exactly the same lengths, that length is somewhere between single and double bonds. Benzene is very stable because delocalized electrons above and below the plane of the ring.
Answer 6
Answer : Atomic number = 79 Atomic mass = 197 Number of orbits = 6 Number of neutrons = 118 Number of electrons in (n=3) = 18 Number of valence electrons = 1 Explanation : According to the given image of gold metal, The atomic number is located above the element symbol, in the upper left-hand of the corner of square (Atomic number = 79). The atomic number tell us about that how many number of protons are present in element. And the number of protons is equal to the number of electrons. The atomic mass is located below symbol of element. (Atomic mass = 197) To find the number of neutrons, we will need of the atomic number and the atomic mass. This means, The number of neutrons = Atomic mass – Atomic number The number of neutrons = 197 – 79 = 118 The electronic configuration of gold element (Au) = Number of orbits = Number of energy level (n) = 6 where, ‘n’ is principle quantum number Number of electrons in (n=3) = 18 Number of valence electron = 1 ( according to electronic configuration, the valence shell in gold is )
atomic mass = 39 number of neutrons = 20 number of protons= 19 electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1 the number of electron in first shell = 2 number of electrons in n=3 shell = 8
1. Silicon is in the same group and also has 4 valence electrons.2. covalent3. 14. Wood6. 1s22s22p27. Covalent Those questions were somewhat simple. Questions #5 and #8 I’m not certain of and if you have any kind of textbook or course material, it’d be beneficial to look at it. I hope you were able to figure out the answer to Question #4 was “Wood”, otherwise your teacher must be slacking :P. I’ll try to figure out the answers to #5 and #8 and let you know what I figured out.
Answer 7
Answer : Atomic number = 79 Atomic mass = 197 Number of orbits = 6 Number of neutrons = 118 Number of electrons in (n=3) = 18 Number of valence electrons = 1 Explanation : According to the given image of gold metal, The atomic number is located above the element symbol, in the upper left-hand of the corner of square (Atomic number = 79). The atomic number tell us about that how many number of protons are present in element. And the number of protons is equal to the number of electrons. The atomic mass is located below symbol of element. (Atomic mass = 197) To find the number of neutrons, we will need of the atomic number and the atomic mass. This means, The number of neutrons = Atomic mass – Atomic number The number of neutrons = 197 – 79 = 118 The electronic configuration of gold element (Au) = Number of orbits = Number of energy level (n) = 6 where, ‘n’ is principle quantum number Number of electrons in (n=3) = 18 Number of valence electron = 1 ( according to electronic configuration, the valence shell in gold is )
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Explanation: Atomic mass means the summation of total number of protons and neutrons present in an atom. The given phrases shows that highest number is 39 and it is known that number of neutrons is generally greater than number of protons. But if there is a large difference in the number of protons and neutrons then it means that the atom is unstable. Therefore, if number of protons is 19 and number of neutrons is 20 then atomic mass of the atom will be 19 + 20 = 39. Also, for a neutral atom number of protons equal number of electrons. Hence, electronic distribution for an atom with 19 electrons will be 2, 8, 8, 1. It means that there are 2 electrons in n = 1, 8 electrons in each n = 2 and n =3 shell and 1 electron in n = 4 shell. Thus, we can conclude that the phrases with their corresponding values are matched as follows. 1.number of protons : 19 2.atomic mass: 39 3.number of electrons in the n = 1 shell : 2 4.number of electrons in the n = 3 shell : 8 5.number of neutrons : 20
For 1: Atomic number : 79 For 2. Atomic mass : 197 For 3. Number of orbits : 6 For 4. Number of neutrons : 118
For 5. Number of electrons in n=3 : 18
For 6. Number of valence electrons : 1 Explanation: Atomic number is defined as the number of protons or electrons present in an atom. Here 79 corresponds to the Atomic Number.Atomic mass is defined as the Sum of neutrons and protons present in an atom. Here, 197 corresponds to the Atomic Mass.Atomic Mass = Number of protons + Number of neutrons Here, Number of protons = 79 So, Valence electronic configuration of the atom having atomic number as 79 is : Number of orbit corresponds the higher value of ‘n’ which is the principle quantum number. Here, n = 6 so, number of orbits are also 6. In orbit having n = 3, there are 3 sub-shells: s, p and d. The number of electrons that can be occupied in s-subshell = 2 The number of electrons that can be occupied in p-subshell = 6 The number of electrons that can be occupied in d-subshell = 10 Total number of electrons that can be occupied in orbit having n = 3 are (2 + 6 + 10) = 18 electrons. From the electronic configuration, it is visible that valence electrons in atom having atomic number 79 is 1.
Explanation: 1. number of protons 19 2. atomic mass 39 3. number of electrons in the n = 1 shell 2 4. number of electrons in the n = 3 shell 8 5. number of neutrons 20 An atom is made up of three fundamental particles. Protons are the positively charged particles found in the nucleus with the neutrons. Neutrons do not carry any charges. Both proton and neutron add up to give the mass number of an atom. Electrons have negligible mass and they are negatively charged. Atomic mass = Number of protons + Number of neutrons. From the given options: number of protons will be 19 and it is the same as number of electrons. The atom is potassium. Learn more: Atoms #learnwithBrainly
Answer 6
Answer : Atomic number = 79 Atomic mass = 197 Number of orbits = 6 Number of neutrons = 118 Number of electrons in (n=3) = 18 Number of valence electrons = 1 Explanation : According to the given image of gold metal, The atomic number is located above the element symbol, in the upper left-hand of the corner of square (Atomic number = 79). The atomic number tell us about that how many number of protons are present in element. And the number of protons is equal to the number of electrons. The atomic mass is located below symbol of element. (Atomic mass = 197) To find the number of neutrons, we will need of the atomic number and the atomic mass. This means, The number of neutrons = Atomic mass – Atomic number The number of neutrons = 197 – 79 = 118 The electronic configuration of gold element (Au) = Number of orbits = Number of energy level (n) = 6 where, ‘n’ is principle quantum number Number of electrons in (n=3) = 18 Number of valence electron = 1 ( according to electronic configuration, the valence shell in gold is )
Atomic mass = 39 number of neutrons = 20 Number of protons= 19 Electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1 The number of electron in first shell = 2 number of electrons in n=3 shell = 8
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Explanation: Atomic mass means the summation of total number of protons and neutrons present in an atom. The given phrases shows that highest number is 39 and it is known that number of neutrons is generally greater than number of protons. But if there is a large difference in the number of protons and neutrons then it means that the atom is unstable. Therefore, if number of protons is 19 and number of neutrons is 20 then atomic mass of the atom will be 19 + 20 = 39. Also, for a neutral atom number of protons equal number of electrons. Hence, electronic distribution for an atom with 19 electrons will be 2, 8, 8, 1. It means that there are 2 electrons in n = 1, 8 electrons in each n = 2 and n =3 shell and 1 electron in n = 4 shell. Thus, we can conclude that the phrases with their corresponding values are matched as follows. 1.number of protons : 19 2.atomic mass: 39 3.number of electrons in the n = 1 shell : 2 4.number of electrons in the n = 3 shell : 8 5.number of neutrons : 20
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