Page No 53: - Chapter 4 - Structure Of Atom - Ncert Solutions class 9 - Science
Updated On 26-08-2025 By Lithanya
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Question 1:
For the symbol H, D and T tabulate three sub-atomic particles found in each of them.
Answer:
|
Symbol |
Proton |
Neutron |
Electron |
|
H |
1 |
0 |
1 |
|
D |
1 |
1 |
1 |
|
T |
1 |
2 |
1 |
Question 2:
Write the electronic configuration of any one pair of isotopes and isobars.
Answer:
Two isotopes of carbon are 
and
.
The electronic configuration of is 2, 4.
The electronic configuration of is 2, 4.
[Isotopes have the same electronic configuration]
and 
are a pair of isobars
The electronic configuration of is 2, 8, 8, 2.
The electronic configuration of is 2, 8, 8.
