Question

What do the numbers listed for an element on the periodic table represent?

The smaller number is the mass and the greater number is the atomic number.

The smaller number is the number of protons and the greater number is the mass.

The smaller number is the number of neutrons and the greater number is the number of electrons.

The smaller number is the number of neutrons and protons and the greater number is the number of electrons.

Answer 1

The smaller number is the mass (in u), and the greater number is the atomic number (which is equal to the number of protons).

Answer 2

thank you!

Answer 3

Not true.

This small number is the atomic number, which is the number of protons.

The larger number is the atomic mass, which in simple terms is the number of neutrons and protons in the nucleus.

The atomic mass can be expressed as an integer, reflecting the make up of the most common isotope of an element; or it can appear as a non-integer, reflecting the relative occurrence of each isotope variety of that element.

Answer 4

I think both answers are true depending on what you mean by the "larger" and "smaller" numbers...

In terms of font size, atomic number is generally larger than the atomic mass.
In terms of magnitude, atomic mass is larger as it is the combination of protons and neutrons (weighing between isotopes)

Question is not very clear about it, but if you can justify either answer you are fine.