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23-06-2016
Chemistry

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Which of the following elements has three valence electrons?
a. sodium
b. argon
c. oxygen
d. gallium

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Аноним Аноним

30-06-2016

The number of valence electrons is determined from the position of the element in the periodic table. If the element has three valence electrons,except the noble gases, then the element should be in the third row or period. This element among the choices is A. sodium.

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