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Explanation:
- calcium has 2 electrons on its 1st shell, 8 electrons on its 2nd shell,another 8 electrons of 3rd shell and 2 electrons on its valence shell.
- sulphur ha 2 electrons on its 1st shell , all are same as in calcium but it has 6 valence elcectrons.
- oxygen has 6 electrons on its valence shell.
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