Which statement identifies the first shell around the nucleus?

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Multiple Choice

Which statement identifies the first shell around the nucleus?

Explanation:
The first shell around the nucleus is the K shell. In atomic structure, shells are arranged by increasing distance from the nucleus and are labeled in order as K, L, M, N, with K being the closest (n = 1). This innermost shell can hold up to two electrons. So identifying the first (innermost) shell as the K shell is correct, while L, M, and N refer to shells farther out.

The first shell around the nucleus is the K shell. In atomic structure, shells are arranged by increasing distance from the nucleus and are labeled in order as K, L, M, N, with K being the closest (n = 1). This innermost shell can hold up to two electrons. So identifying the first (innermost) shell as the K shell is correct, while L, M, and N refer to shells farther out.

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