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Practice each question, then open the answer or worked solution.
For the symbols H, D and T, tabulate three subatomic particles found in each of them.
The following table depicts the subatomic particles in Hydrogen (H), Deuterium (D), and Tritium(T).
| Isotope | Symbol | Mass no. | Atomic no. | No. of electrons | No. of protons | No. of neutrons |
| Hydrogen | H | 1 | 1 | 1 | 1 | 0 |
| Deuterium | D | 2 | 1 | 1 | 1 | 1 |
| Tritium | T | 3 | 1 | 1 | 1 | 2 |
Write the electronic configuration of any one pair of isotopes and isobar.
(a) Isotopes: Isotopes are atoms which have the same number of protons, but the number of neutrons differs. This leads to the variation in mass number too.
Example: Carbon molecule exists as 6C12 and 6C14, but when their electronic configuration is noticed, both have K-2; L-4
(b) Isobars: Isobars are atoms which have the same mass number but differ in atomic number. The electronic configuration of an isobar pair is as follows:
Example: Electronic configuration of 20Ca40 – K-2; L-8; M-8; N- 2
Electronic configuration of 18Ar40 – K-2; L-8; M-8