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A neutral atom of an element has 2 electrons in the first energy level, 8 in the second energy level and 8 in the third energy level. This information does not necessarily tell us:  1 point(a) the atomic number of the element.(b) anything about the element's chemical properties.(c) the total number of electrons in s orbitals.(d) the total number of electrons in p orbitals.(e) the number of neutrons in the nucleus of an atom of the element.

Question

A neutral atom of an element has 2 electrons in the first energy level, 8 in the second energy level and 8 in the third energy level. This information does not necessarily tell us:  1 point(a) the atomic number of the element.(b) anything about the element's chemical properties.(c) the total number of electrons in s orbitals.(d) the total number of electrons in p orbitals.(e) the number of neutrons in the nucleus of an atom of the element.

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Solution

The information given does not necessarily tell us:

(e) the number of neutrons in the nucleus of an atom of the element.

Explanation:

(a) The atomic number of an element is equal to the number of protons in the nucleus, which is also equal to the number of electrons in a neutral atom. So, we can determine the atomic number from the given information (2+8+8=18).

(b) The chemical properties of an element are determined by the number of electrons in the outermost energy level (valence electrons). In this case, there are 8 electrons in the outermost energy level, which does tell us something about the element's chemical properties.

(c) The s orbitals can hold a maximum of 2 electrons each. In the first energy level, there is one s orbital (1s), in the second and third energy levels, there are also one s orbital each (2s and 3s). So, we can determine the total number of electrons in s orbitals (2 in 1s, 2 in 2s, and 2 in 3s = 6).

(d) The p orbitals can hold a maximum of 6 electrons each. In the second and third energy levels, there are one p orbital each (2p and 3p). So, we can determine the total number of electrons in p orbitals (6 in 2p and 6 in 3p = 12).

(e) The number of neutrons in the nucleus of an atom is not related to the number of electrons in the energy levels. Therefore, the given information does not tell us anything about the number of neutrons in the atom.

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