sir as lithium and magnesium have approximately same size do sodium and magnesium have same size? if not why

Asked by Alekhya K | 7th Dec, 2013, 07:58: PM

Expert Answer:

Lithium and magnesium have approximately same size because there exist diagonal relationship between them.

The diagonal relationship does not exist between third and fourth periods such as between sodium and calcium. Thus, the atomic size of calcium (Z=20) is larger than that of sodium (z=11).

This is because atomic size of elements in the same group increase down the group. Since, atomic number increases down the group, number of shells increases and atomic size increases. Thus, Atomic radius of sodium is 186 pm and that of calcium is 197 pm.

Answered by Hanisha Vyas | 9th Dec, 2013, 01:34: PM

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