Question

12. An element has 56 nucleons in nucleus and if it is
isotonic with 30 Y60. Which group and period does
it belong to?
(1) 8th group, 4th period
(2) 14th group, 3rd period
(3) 12th group, 3rd period
(4) 12th group, 4th period

pls provide explanation along with your answer ​

Answer 1

Answer: 1

Explanation:

Answer 2

Given,

The number of nucleons in an element = 56

The given element is isotonic with ₃₀Y⁶⁰.

To Find,

The group and period, of the given element in the periodic table.

Solution,

Elements are said to be isotonic if they possess the same number of neutrons but vary in the number of protons.

As the given element is isotonic with  ₃₀Y⁶⁰, both possess the same number of neutrons.

The difference in the mass number and atomic number indicates the number of neutrons.

Thus, the number of neutrons in ₃₀Y⁶⁰ = $60-30 =30$

∴ The number of neutrons in the given element is also 30.

The number of protons, that is mass atomic number can be calculated as follows:

Atomic number = Total number of nucleons - number of neutrons.

                          = 56-30

                          = 26

∴ The atomic number of the given element is 26, that is Fe, Iron.

The group number of Fe is eighth and belongs to the fourth period of the periodic table.

Henceforth, the group number and period of the given element are 8, 4 respectively.