Which of the following is true about the mass number? I. It is the total number

Question

Which of the following is true about the mass number?

I. It is the total number or protons and neutrons in the nucleus of a particular isotope of an element.

II. It is underneath the symbol for an element in the periodic table.

III. It is the average mass of all of the isotopes of a particular element.

IV. It appears as the superscript in isotopic notation

Which of the following is true about the atomic mass?

I. It is the total number or protons and neutrons in the nucleus of a particular isotope of an element.

II. It is underneath the symbol for an element in the periodic table.

III. It is the average mass of all of the isotopes of a particular element.

IV. It appears as the superscript in isotopic notation

Explanation / Answer

1) I. It is the total number of protons and neutrons in the nucleus of a particular isotope of an element.

IV. It appears as the superscript in isotopic notation

2) III. It is the average mass of all of the isotopes of a particular element.

IV. It appears as the superscript in isotopic notation

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