Question

how do the following property vary in periodic and in a group of periodic table electropositivity atomic radius
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Answer 1

electropositivity:

Tendency of atoms to lose electrons and form positive ion is known as electropositivity. An element is said to possess more metallic character if it is more electropositive. In a period electropositivity decreases because of increase in ionization energy along a period.

atomic radius:

atomic radius of atoms generally increases from top to bottom within a group. As the atomic number increases down a group, there is again an increase in the positive nuclear charge. However, there is also an increase in the number of occupied principal energy levels. Higher principal energy levels consist of orbitals which are larger in size than the orbitals from lower energy levels. The effect of the greater number of principal energy levels outweighs the increase in nuclear charge and so atomic radius increases down a group.

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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.