Q2 of 24 Page 91

Element X forms a chloride with the formula XCl2 which is a solid with a high melting point. X would most likely be in the same group of the periodic table as :

Mg has the valency 2. So, when it combine with chlorine having valency 1, it forms Mgcl2. Whereas Na has valency 1, Al has valency 3 and Si has valency 4.

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6

By considering their position in the periodic table, which one of the following elements would you expect to have maximum metallic character ?

Ga, Ge, As, Se, Be

 1

Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic table ?

 3

Which element has :

(a) two shells, both of which are completely filled with electrons ?


(b) the electron configuration 2, 8, 2 ?


(c) a total of three shells, with four electrons in its valence shell ?


(d) a total of two shells, with three electrons in its valence shell ?


(e) twice as many electrons in its second shell as in its first shell ?

 4

What property do all elements in the same column of the periodic table as boron have in common ?