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4 votes
_______ is isoelectronic with helium.
A. B3-
B. H-
C. N3-
D. H+
E. H

1 Answer

3 votes

Final answer:

The element that is isoelectronic with helium is hydrogen.

Step-by-step explanation:

The correct option is B. H.

Isoelectronic means having the same number of electrons. Helium has 2 electrons. Hydrogen also has 1 electron. Therefore, hydrogen is isoelectronic with helium because they both have the same number of electrons.

Option H is also hydrogen but in its positive ion state, which means it has lost an electron. Therefore, it is not isoelectronic with helium.

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