Q4 of 24 Page 91

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

Boron belongs to group 13 in the periodic table. It has 3 valence electrons, hence its valency is 3. Therefore, all the elements in the same column of the periodic table as boron will have valency of 3.


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2

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 :

 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 fluorine have in common ?

 5

An atom has electronic configuration 2, 8, 7.

(a) What is the atomic number of this element ?


(b) To which of the following elements would it be chemically similar ? (Atomic numbers are given in parentheses)


N (7) F (9) P (15) Ar (18)