Joyita was studying chapter of chemical reactions. She was trying to recollect the concept of valency and valence electrons. She also remembered valency exhibited by an element is important in order to study chemical formulae. She started making a list of valency for different element. She wants to write down the valency possible for an element X which has 2 electrons in its outermost shell. Help her to write down the valency exhibited by element X with proper justification. Also help her to write down one main point of differentiation between valence electrons and valency.
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the possibility of X are magnesium;calcium; beryllium etc.
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the element will magnesium or BERYLLIUM
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