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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
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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)

User Kshitij Banerjee
by
8.3k points

2 Answers

2 votes

The answer is C (magnesium (Mg)


User Jwvh
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8.0k points
4 votes
mg magnesium becuase one period down and one group to the side

User Katone Vi
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7.8k points
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