Answer:
Magnesium-
atomic symbol: Mg
the total number of electrons: 12
group number: 2
the number of valence electrons: 2
Nitrogen:
atomic symbol: N
the total number of electrons: 7
group number: 15
the number of valence electrons: 5
Oxygen:
atomic symbol: O
the total number of electrons: 8
group number: 16
the number of valence electrons: 6
Potassium:
atomic symbol: K
the total number of electrons: 19
group number: 1
the number of valence electrons: 1
Sodium:
atomic symbol: Na
the total number of electrons: 11
group number: 1
the number of valence electrons: 1
Step-by-step explanation:
Sorry that I couldn't answer the other questions, they are hard to see. I got these from the periodic table. Hope this helps!