State whether True or False (T/F).
The valency of helium is zero.
State whether the following statement is true or false :
On going down in a group of the periodic table, the number of valence electrons increases.
Valency can be expressed in fractions.
To write the chemical formulae, one must know the valency of the element. State whether the statement is True/False.
Valency and oxidation state of an element is same - True or False?