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sertanlavr [38]
2 years ago
13

An atom of elements x has one more shell of electrons than an atom of beryllium,but h are s one less valence electron then beryl

lium.which element is element X?
Chemistry
1 answer:
Ilia_Sergeevich [38]2 years ago
5 0

Element X is sodium.

If there is one more shell of electrons, then this means it is one period below.

Since there is one less valence electron, it is one group to the left.

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