What is chemical reaction ??

A chemical reaction involves, breaking and making of bonds between reactants to give rise to formation of new products. A chemical reaction is basically rearrangement of atoms.

A process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction...☺

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since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.