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Modern periodic law.

The physical and chemical properties of the elements repeat periodically with their atomic number.

What is molecular formula?

A molecular formula is a chemical formula which consists of the chemical symbols for the constituent elements followed by numeric subscripts describing the number of atoms of each element present in the molecule.

What is electronegativity?

Electronegativity is the tendency of an atoms to attract a shared pair of electrons towards itself in a covalent bond formed between it and another atom.

What is covalent bond?

The bond formed by sharing of electrons to obtain stable electron configuration at the outermost energy level is called covalent bond.

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