Question

0-27). (a) Arrange the following species in increasing order of their ionic sizes
N-NaF 0²-
(b) How does atomic radius vary in a period and in a group? How do you explain
variation?​

Answer 1

Answer:

Explanation:

B ) In a period, from left to right, with increase in the atomic number, the atomic radius decreases due to increase in the nuclear charge which increases the attraction of the nucleus for the valence electrons. In a group, on moving from top to bottom, the ionic

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.