Seudónimo Seudónimo

01-11-2015
Physics

contestada

An atom of element X has one more shell of electrons than an atom of beryllium, but it has one less valence electron than beryllium. Which element is element X?
sodium (Na)
boron
b. magnesium (Mg)
lithium (Li)

Respuesta :

Toxic56454 Toxic56454

01-11-2015

mg magnesium becuase one period down and one group to the side

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hannahsmith119 hannahsmith119

19-10-2018

The answer is C (magnesium (Mg)

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