Question

Twenty radicals with formula and valency

Answer 1

Have a look at the attached picture
Hope this helps

Answer 2

Valency is simply equal to the number of electrons gained, lost or shared by an atom of an element to achieve the nearest noble gas configuration. For example, the valency of sodium (Na) is 1, magnesium (Mg) is 2, Chlorine (Cl) is 1 etc.

radical is an atom or a group of atoms of the same or different elements that behaves as a single unit with a positive or negative charge.

The molecular formula is an expression that defines the number of atoms of each element in one molecule of a compound. It shows the actual number of each atom in a molecule. For example, the molecular formula of propane is C4H10. In this formula, there are 4 carbon atoms and 10 hydrogen atoms in the given compound.