Electron configuration elements (atoms) and ions

Solution:- Atomic number of F is 9 and it has 9 electrons. It's electron configuration is:-

Atomic number of is 9 and it has 10 electrons. This ion is formed when F accepts one electron to gain nearest noble gas electron configuration.

Atomic number of O is 8 and it has 8 electrons. It's electron configuration is:-

Atomic number for is 8 and it has 10 electrons. This ion is formed when O accepts two electrons to gain nearest noble gas electron configuration.

Atomic number for Na is 11 and it has 11 electrons. It's electron configuration is:-

Atomic number for is 11 and it has 10 electrons. It loses one electron from it's outer most shell to look like it's nearest noble gas.(Ne)

It's electron configuration is:-

Atomic number of Ca is 20 and it has 20 electrons. It's electron configuration is:-

Atomic number of is 20 and it has 18 electrons. It loses two electrons from it's outer most shell to look like it's nearest noble gas.(Ar)

It's electron configuration is:-

i think 4.44 moles