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Mars2501 [29]
3 years ago
5

An atom of element X has one more shell of electrons than an atom of beryllium, but it has one less valence electron than beryll

ium. Which element is element X?
sodium (Na)

boron (B)

magnesium (Mg)

lithium (Li)
Physics
2 answers:
3241004551 [841]3 years ago
8 0
The correct answer is Sodium
KengaRu [80]3 years ago
7 0

Answer:

sodium (Na)

Explanation:

The valence electron configuration of the given elements are as follows:

Sodium (Na) = 3s¹

Boron (B) = 2s²2p¹

Magnesium (Mg) = 3s²

Lithium (Li) = 2s¹

The valence electron configuration of beryllium (Be) = 2s²

The outer shell in Na is 3s i.e. n = 3 relative to that of Be where n = 2

Also the valence shell in Na has 1 s electron i.e. one electron lower than Be.

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Answer:

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What is the momentum of an object that is moving in a straight line at a speed of 10 m/s and has a mass of 10 kilograms?
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Question (continuation)

(a) What is the change in electric potential energy when the dipole moment of a molecule changes its orientation with respect to E S from parallel to perpendicular?

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b. 0.44K

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Given

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a.

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b.

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