CBSE Class 9 Answered
Composition of the nuclei of two atomic species 'X' and 'Y' are given below.
X Y
Protons 8 8
Neutrons 8 10
(a) Write the mass number of X and Y respectively.
(b) Write the electronic configuration of the element 'X'.
(c) Is there any similarity between X and Y? How are they related to each other.
Asked by Topperlearning User | 04 Apr, 2016, 10:40: AM
Expert Answer
(a) Mass number of X = no. of protons + no. of neutrons
= 8 + 8 = 16
Mass number of Y = 8 + 10 = 18
(b) Electronic configuration of X:
K L
2 6
(c) Since X and Y have same no. of protons so, their electronic configuration and valency will also be same hence they are isotopes.
Answered by | 04 Apr, 2016, 12:40: PM
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