Q21 of 31 Page 198

Using the periodic table, predict the formula of compound formed between and element X of group 13 and another element Y of group 16.

To predict the formula of a compounds formed, first we will calculate the valency of each element.


Element X of group 13


Valency = 8-3 = 5


Element Y of group 16


Valency = 8-6 = 2


The formula formed will be: X2Y5



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On the basis of atomic number predict to which block the elements with atomic number 9, 37, 46 and 64 belongs to?

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An element X belongs to 3rd period and group 2 of the periodic table. State

(a) The no. of valence electrons


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