Which of the following remains constant while moving down the group of the periodic table?.
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Answer:
no. of valence electron
Explanation:
as we move down there is a successive increase. in the size of element as a new shell is being added but the no. of valence electrons remain same.e.g
Li:1s2 2s1
Na: 1s2 2s2 2p6 3s1
in the above example Li belongs to period 2 amd Na belongs to period 2 but both are the members of the group1A so they have 1 electron in their valence orbital
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