Question

How do the properties of electropositivity and atomic radius vary in a period and in a group of periodic table

Answer 1

as we move from left to right in a period, the metallic character reduce, so electropositivity also reduces. and atomic radius also decreases because the number of electrons and protons increase which causes more force inside the atom, so the size of atom decreases.

as we move from top to bottom in a group, electropositivity increases and atomic radius increase due to more shellls...

Answer 2

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Atomic radius of the elements generally decreases from left to the right in a period because on moving from left to right in a period the nuclear charge gradually increases by one unit and one electron is also added in the electron shell. Due to this the electrons get attracted more and more towards the nucleus consequently the atomic radii decrease.

Atomic radius of the elements increases as we move downwords in a group because on moving down a group there is an increase in principal quantum number and thus, increase in the number of electron shells. Therefore the atomic size is expected to increase.