Which of the following gases is the best choice for inflating a balloon that must remain inflated for a…?

Which of the following gases is the best choice for inflating a balloon that must remain inflated for a long period of time?

Please state your choices
Hydrogen is the answer by the way because helium is so small it leaks out too easily!
Edit/ So it’s Argon. The biggest.

Boy 1: Leo Alexander James Girl 1: Julia Violet Jane Boy 2: John-Sebastian Theodore Girl 2: Audrey-Jane Ella Girl 3: Elizabeth Juliana Boy 3: Felix Beckham Girl 4: Lily Violet BQ: Boy likes: Alexander, Peter, Leo, Felix, James, William, John, Hugo, Jackson, Joel, Sebastian, Theodore, Oliver Boy dislikes: Hector, Lysander, Paul, Alistair, Elton, Anthony, Gabriel, Victor, Jasper, Casper, Dion, Ari, Glen, Paris, Aubrey, Marcus, Vivian, Asper, Ari, Dorian, Ray The rest I’m either neutral on or don’t have a strong feeling towards either way. Girl likes: Anastasia, Penelope, Phoebe, Sophia, Helena, Julia, Violet, Jane, Lily, Juliet, Ella, Annabel, Serafina, Elizabeth, Juliana, Alice, Evangeline, Hannah Girl dislikes: Josephine, Belinda, Nicole, Gabrielle, Arielle, Opal, Pearl, Serena, Jade, Alanna, Tanya, Celeste, Kimberly, Audrey, Amber, Cassandra, Chloe, Angeline, Selena, Kiara, Paula, Alannis, Clytemnestra, Angela Again, the rest I’m either neutral on or don’t have a strong feeling towards either way. BQ2: From the names I made, I like Leo Alexander James, Elizabeth Juliana, and Felix Beckham!

I’d guess argon, weighing in at 40 amu, with 0₂, weighing in at 32 amu, running second. The heavier, the slower moving, the slower leaking.

You forgot to list them

what are the gases you have to choose from?

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