Question

In Modern periodic table, Nitrogen is placed just before Oxygen in 2nd period because

• A. Nitrogen has bigger atomic radius than Oxygen
• B. Oxygen is more electronegative than Nitrogen
• C. Oxygen have one more proton in its nucleus than Nitrogen
• D. The given statement is false. In modern periodic table Oxygen is placed before

Answer 1

The correct option is C

Oxygen have one more proton in its nucleus than Nitrogen

Elements are classified in the Modern periodic table based on their increasing atomic number. So all the other reasons (even correct) will not be considered while deciding the placement of elements in the periodic table.

Now, atomic no. is the number of protons present in the nucleus of an atom. Nitrogen has 7 protons and Oxygen has 8. Hence Nitrogen is placed just before Oxygen.