Question

Based on the representation, which of the following statements about the element is true? (3 points) 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.

Answer 1

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

Explanation: The mass number is always the sum of protons plus neutrons and the mass number for this element is 20.1797 so that is the sum of the masses of the protons plus the neutrons.

Answer 2

Answer: the sum of the masses of proton and neutron 20.1797

Explanation: other options are wrong as only the sum of protons and neutrons will amount to the mass number of the elements