Chemistry
The following table shows the electronic configuration of the atoms A, B, C and D.
| Element | A | B | C | D |
| Electronic configuration | 2, 8, 8, 2 | 2, 6 | 2, 8, 7 | 2, 4 |
(a) Write the formula of the compound formed between:
- A and B
- D and C
(b) Which of the above elements will exhibit catenation?
Chemical Bonding
ICSE 2024
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Answer
(a)
AB is the formula of the compound formed between A and B.
Reason — A has 2 electrons in its outermost shell. B has 6 electrons in its outermost shell. To form a compound between A and B, A will donate its 2 outermost electrons to B. Hence, the formula of the compound is AB as both have 2 as valency.DC4 is the formula of the compound formed between D and C.
Reason — D has 4 electrons in its outermost shell. C has 7 electrons in its outermost shell. Therefore, their valency is 4 and 1 respectively. So, 4 atoms of C will share their one electron each with one atom of D to form a compound. Hence, the formula of the compound is DC4.
(b) D will exhibit catenation.
Reason — Electronic configuration of D (2, 4) suggests that it is Carbon. Carbon exhibits catenation to the maximum extent due to tetra-covalency of carbon and greater strength of carbon-carbon bond.
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