Why sodium and chlorine lie in the same period of the modern peroidic table?
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Sodium and chlorine fall in the same period in the modern periodic table because:
They have the same number of shells which is 3
What this means is that atoms of both elements have 3 shells.
And all elements in a period have same no. of shells so, all elements in period 1 will have 1 shell and in period 2 will have 2 shells...
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because they have same amount of shells
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