Which substance is being oxidized and which is being reduced?
4Ag(s) + 2H2S(g) + O2(g) -->
2Ag2S(s) + 2H2O(g)

Oxygen is being oxidized while Ago is reduced

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.

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