Question

Question 2.3 How many neutrons and protons are there in the following nuclei?

C (13,6) , O (16,8) , Mg(24,12) , Fe(56,26) , Sr(88,38)

Class XI Structure of Atom Page 65

Answer 1

concept :
The digit written as subscript represents the atomic number ( Z) and that as superscript represents the mass number ( A) of the element.
and the number of neutron = A - Z

¹³₆C
-----------------
atomic number ( Z) = 6
atomic mass ( A) = 13
number of protons ( Z) = 6
number of neutrons (A - Z) = 13 - 6 = 7

¹⁶₈O
-----------
atomic number ( Z) = 8
atomic mass ( A ) = 16
number of protons ( Z) = 8
number of neutrons ( A - Z ) = 16 - 8 = 8

²⁴₁₂Mg
------------
atomic number ( Z ) = 12
atomic mass ( A ) = 24
number of protons ( Z) = 12
number of neutrons ( A -Z ) = 24 - 12 = 12

⁵⁶₂₆Fe
-------------
atomic number ( Z ) = 26
atomic mass ( A ) = 56
number of protons ( Z ) = 26
number of neutrons ( A - Z ) = 56 - 26 = 30

⁸⁸₃₈Sr
----------
atomic number ( Z ) = 38
atomic mass ( A ) = 88
number of protons ( Z ) = 38
number of neutrons ( A - Z ) = 88 -38 = 50

Answer 2

Explanation:

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