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Write a short answer to the following questions in a few sentences:
1. Write the formula of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev.
Germanium is Eka-silicon. The formula is .
Gallium is Eka-aluminium. The formula is .
Gallium is Eka-aluminium. The formula is .
2. Arrange the following elements in increasing order of their atomic radii,
(a) Li, Be, F, N
(b) Cl, At, Br, I
(a) Li, Be, F, N
(b) Cl, At, Br, I
(a) increases the order of atomic size because atomic size decreases along a period from left to right.
(b) is increasing order of atomic size because atomic size increases down the group due to an increase in the number of shells.
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