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Which of the following atomic numbers of elements will have the chemical and physical properties resembling calcium (atomic number $20$ ), in the modern periodic table?

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38

12

19

21

answer is A.

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Detailed Solution

The element with atomic number

12

will have the chemical and physical properties resembling calcium (atomic number

20

), in the modern periodic table.
The atomic number of calcium (Ca) is

20

, so the electronic configuration is

2, 8, 8, 2

. Thus, calcium has

2

valence electrons. So, the element with

2

valence electrons will have physical and chemical properties resembling calcium. So, the electronic configuration of atomic number

12

2, 8, 8, 2

and the electronic configuration for atomic number

19

2, 8, 8, 1

. So, the element having atomic number

12

has

2

valence electrons, just like calcium. So, the element with atomic number

12

magnesium (Mg) will have chemical and physical properties resembling calcium.

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