The atomic number of an element is 8. How many electrons will it gain to form a compound with sodium?
One
Two
Three
Four
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC NDA-2 – 2018
– To achieve a stable octet configuration in its outermost shell, Oxygen needs to gain 8 – 6 = 2 electrons, forming the O²⁻ ion.
– Sodium (Na, atomic number 11) has electronic configuration 2, 8, 1 and tends to lose 1 electron to form the Na⁺ ion.
– In the formation of sodium oxide (Na₂O), two sodium atoms each lose one electron, and one oxygen atom gains two electrons.