Answer: Option (c) is the correct answer.
Explanation:
Atomic mass is the summation of no. of protons and average number of neutrons present in an element.
On the other hand, atomic number is the sum of total number of protons only which are present in an element.
Each element of a periodic table has a different fixed number of protons. Knowing the number of protons or atomic number we do not get to know about the number of neutrons.
For example, atomic number of Na is 11 but it does not tell that Na also contains 12 neutrons.
Thus, we can conclude that when a neutral atom has two, eight, eight electrons in its first, second, and third energy levels. This information does not tell us about the atomic mass of the element.
Energy levels similarly called electron shells are defined as a fixed set of distances from an atom's nucleus where electrons can be located. If you look at a schematic view of an atom, you'll notice that the nucleus is in the middle. The energy levels are developed from the level nearest to the nucleus outward.
Given that:
Thus, the atomic number of the neutral atom is:
= 2 + 8 + 8
= 18
From the atomic number, we can deduce that the name of the neutral atom is Argon.
Therefore, we can conclude that the neutral atom that has two, eight, eight electrons in its first, second, and third energy levels is known as Argon
Learn more about energy levels here:
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