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Write the chemical symbols for three different atoms or atomic anions with 18 electrons.

1) Atomic number of argon (Ar) is 18, it means that it has 18 protons and 18 electrons. Electron configuration of argon atom: ₁₈Ar 1s² 2s² 2p⁶ 3s² 3p⁶. 2) Atomic number of chlorine (Cl) is 17, it means that it has 17 electrons and 17 protons, but if it receive one electron, it becomes anion Cl⁻ with 18 electrons. Electron configuration of chlorine anion: ₁₇Cl⁻ 1s² 2s² 2p⁶ 3s² 3p⁶. 3) Atomic number of sulfur (S) is 16, it means that it has 16 electrons and 16 protons, but if it receive two electrons, it becomes anion S²⁻ with 18 electrons. Electron configuration of sulfur anion: ₁₆S²⁻ 1s² 2s² 2p⁶ 3s² 3p⁶.

Three different atoms or atomic anions with 18 electrons: Cl⁻, K⁺, Ar Further explanation The Atomic Number (Z) indicates the number of protons in an atom of an element. If the atom is neutral then the number of protons will be equal to the number of electrons. So the atomic number can also indicate the number of electrons.  So atomic number = number of protons = number of electrons Mass Number (A) is the sum of protons and neutrons Mass Number (A) = Number of protons + Number of Neutrons So that the relationship between atomic numbers and mass numbers can be formulated as follows: Atomic Number (Z) = Mass Number (A) – Number of Neutrons In the following element notation, Information X = symbol of elemental atom A = mass number   = number of protons + number of neutrons Z = atomic number   = number of protons = number of electrons, on neutral elements In an atom, there are levels of energy in the skin and sub skin. This energy level is expressed in the form of electron configurations. Charging electrons in the sub skin uses the following sequence: 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc. The location of the element group in the periodic system is determined by the number of valence electrons that fills the last sub-skin The element period is determined from the valence shell (the largest main quantum number (n)) Atoms or ionic atoms that have 18 electrons include: 1. Atom: Ar: 1s² 2s² 2p⁶ 3s² 3p⁶2. Atomic ion a. Cl: 1s² 2s² 2p⁶ 3s² 3p⁵ because it captures 1 more electron to be stable like the noble gas Ar so that the electron configuration has 18 electrons Cl-: 1s² 2s² 2p⁶ 3s² 3p⁶ b. S: 1s² 2s² 2p⁶ 3s² 3p⁴ catch 2 electrons to be stable S²⁻: 1s² 2s² 2p⁶ 3s² 3p⁶ c. K: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ release 1 electron to stabilize it K⁺: 1s² 2s² 2p⁶ 3s² 3p⁶ d. Ca: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² release 2 electrons to stabilize Ca²⁺: 1s² 2s² 2p⁶ 3s² 3p⁶ While the notation of the symbol elements are: Learn more element symbol the chemical symbols Identify the group number Keywords: the chemical symbols, electron configuration

1. they vary with a higher number because boiling is way hotter than melting

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Write the chemical symbols for three different atoms or atomic anions with 18 electrons.

When you’re learning chemistry, one of the first things you’ll learn is the chemical symbols for the different atoms and atomic anions. Sometimes it can be a little tricky to remember them all, which is why we’ve compiled this list of atomic symbols with 18 electrons so that you can have them at your fingertips when studying for exams or just practicing basic chemical vocabulary.

ION

The first atom that you will encounter is sodium (Na), which has one electron in its nucleus. Sodium atoms have a single positive charge, and they are found in salt.

The next atom that you will learn about is potassium (K), which has two electrons in its nucleus. Potassium atoms have a double negative charge, and they are found in potassium iodide.

The final atom that you will study is calcium (Ca), which has three electrons in its nucleus. Calcium atoms have a triple negative charge, and they are found in calcium chloride.

Cation

The cation is an atom or molecule that has lost one or more electrons. Cations are usually negatively charged particles.

The most common cations are ions with the atoms nitrogen, aluminium, and potassium. Nitrogen and aluminium have six protons in their nucleus, while potassium has five. When these elements lose electrons they form ions with the same number of protons but a different number of electrons.

The most common ions are sodium (Na), chlorine (Cl), and magnesium (Mg). Sodium and chlorine have one electron less than potassium, while magnesium has two. This means that sodium and chlorine are called anions, while magnesium is called a cation.

Anion

An anion is a molecule that has lost one or more electrons. These molecules are often represented by the chemical symbols electron deficient ion (e-) or minus ion (n). The most common anions are the hydrogen atom, which has one electron missing, and the chlorine atom, which has five electrons missing.

There are many different types of anions, but the three most common are the hydrogen anion (H+), the chloride ion (Cl-), and the bromide ion (Br-). Each of these anions has a different chemical properties. For example, the hydrogen anion is a gas while the chloride ion is a liquid. The bromide ion is a solid.

The chemistry of anions can be very complex. For example, the hydrogen atom can join with other atoms to form compounds called acids. Acids are powerful chemicals that can damage tissue if they’re ingested or breathed in.