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The image shows the representation of an unknown element in the periodic table.

A square is shown. Inside the square ten is written at the top righthand side. To the middle left side, Symbol is written. Below it Name is written. And further below near the bottom edge of the square, twenty point one seven nine seven is written.

Based on the representation, which of the following statements about the element is true?
The total number of protons plus electrons is 10.
The number of neutrons in an atom of the element is 20.
The sum of the masses of protons and neutrons is 20.1797.
The mass of only the protons in the nucleus is 20.1797.

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Answer is: The sum of the masses of protons and neutrons is 20.1797.

This element (neon) has atomic number (Z) 10, which means it has 10 protons and 10 electrons.

Atomic number (Z) is the number of protons, which is characteristic of a chemical element.

Atomic mass (A) is 20.1797.

Ar is relative atomic mass (the ratio of the average mass of atoms of a chemical element to one unified atomic mass unit) of an element .

Answer:

the sum of the masses of protons and neutrons is 20.1797

Explanation:

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