Mathematical Representations Quick Check Can you post all the answers for this quick check

Which statement about a chemical reaction supports the claim that mass is conserved?

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

ok whats the question if not i cannot you i need question and need a thing to answer

4d^55s^1 ( third choice)