Chalcogens are the elements of Group _______

X(g) → X+(g) + e–. What does this chemical reaction need to occur?

Metals consist of __% of the elements known.

O2-, F–, Na+ and Mg2+ are called as ______

What happens to the non-metallic nature as we move from left to right in groups?

Which block elements are known as inner transition elements?

What are the roots of 1, 1, and 9 respectively as per the IUPAC nomenclature, and find out its symbol?

The location of any element in the periodic table is determined by the ______ of the filled last orbital.