Question

which one of the following pair of elements have similar properties?
a)13,31
b)11,20
c) 12,10
d)21,33
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Answer 1

Answer:

13&31

Explanation:

because it in same group

Answer 2

Answer:

The correct answer is option (a) 13, 31.

The elements having atomic numbers 13 and 31 have similar properties.

Concept:

Periodic Classification of elements.

Find:

The pair having similar properties.

Solution:

The elements belonging to the same group, having the same electronic configuration, and the same number of valence electrons are said to have similar properties.

If I talk about the first pair of elements given, they both belong to the same group.

The element having atomic number 13 is Aluminium and atomic number 31 is Galium. They both belong to group III-A and possess the same electronic configuration of the outermost shell and hence have similar properties.

Al (1s² 2s² 2p⁶ 3s² 3p¹)

Ga (1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p¹)

Hence, option (a) is correct.

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