SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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same number of shells
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same number of electrons
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belong in the same family
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None of the above
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Detailed explanation-1: -The shell of an atom that contains the valence (last) electrons is called the valence shell . All the elements in a period of a periodic table have the same number of filled shells and hence also the valence shell.
Detailed explanation-2: -In a period, there is only one electron difference between consecutive elements, but in a shell, there can be as many as two, eight, and so on, but not one. As a result, the shell remains the same.
Detailed explanation-3: -Elements in each period have the same number of electron shells as the number of that period. Hydrogen and helium are in period 1, and both have one electron shell. Carbon, nitrogen and oxygen are all in period 2, and all have two electron shells. And so on.
Detailed explanation-4: -Sodium and aluminium belong to same period, i.e. 3rd period and the elements have same number of shells.
Detailed explanation-5: -Therefore, in the modern periodic table, the number of shells remains the same throughout the period.