Classify each of the substances as a mixture, a compound, or an element ammonia neon copper -g

Among ammonia, neon and copper,

Ammonia is a compound

Neon is an element

Copper is an element

Ammonia is a compound as it is made up of nitrogen and hydrogen that combines in a ratio that is 1 :3 to form 1 mole of ammonia.

And copper and neon are element as they consist of only one type of atom.

So the answer is that Ammonia is a compound

Neon is an element

Copper is an element

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