Which of the following is the lowest common product for the ion values of lithium (Li) and oxygen (O) ?

Hint: Review your periodic table.

4

2

1

6

B. 2

Explanation - Helium with atomic number two is the lowest common product for the ion values of Lithium and Oxygen. The binding energy of lithium is greater than helium.

However, the binding energy of helium is greater than hydrogen. Helium acts more like a noble gas and hence characterized as one of the noble gases.