Question

Why do atoms form ions?

Answer 1

to attain a stability

all the atoms try to attain a noble gas configurations

in noble gas electronic configuration all the orbitals are fully filled

let me explain with examples

take the Na

atomic number is 11

when it looses one electron it will reach to Ne atomic number which is 10

so Na will always try to loose 1 electron and form the Na+

take the Cl

its atomic number is 17

when it gain one electron at will attain a morestable Ar electronic configuration with atomic number 18

Cl alys try to take electron form the anion which is Cl-