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Question

Select the correct answer:
(i) Which of the following electronic structures is of a metal?
(a) 2, 8, 8
(b) 2,7
(c) 2, 8, 2
(d) 2, 8, 4

(ii) Atomic radii of fluorine and neon in angstrom unit are
(a) 0.72, 13.6
(b) 1.60, 1.60
(c) 0.72, 0.72
(d) none of these

(iii) Configuration of an element is 2, 8, 1. Which of the following statement is true?
(a) Valency of element is 7
(b) Element is diatomic
(c) Element is non-metal
(d) Element forms basic oxide

(iv) Which of the following element has highest electronegativity?
(a) F
(b) H
(c) Ne
(d) Na

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Solution

(i) (c) 2, 8, 2
Because it has only 2 electrons in its valence shell that can easily
be donated. Hence, the element with electronic configuration 2, 8, 2 is a metal.

(ii) (d) none of these.
Because both of them do not have same radii. Also, neon does not have that much larger radius than fluorine as given in option (a).

(iii) (d) Element forms basic oxide.
Element with electronic configuration 2, 8, 1 is a metal that has the property to form basic oxides.

(iv) (a) F
Fluorine is the most electronegative element in the periodic table.

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