3. What coefficients do you need to balance the following equation? NH3 + HCl + NH4Cl
O 1, 4, 1
0 1,4, 2
O1, 3,1
O 1, 1,1

we need the questions , i may then you.

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