Which statement accurately compares the trends in atomic number and atomic mass in the periodic table? The atomic number increases from left to right, while the atomic mass increases from right to left.
The atomic mass increases from left to right, while the atomic number increases from right to left.
Both the atomic mass and the atomic number increase from left to right.
Both the atomic mass and the atomic number increase from right to left.

Both the atomic mass and the atomic number increase from left to right

Explanation:

On the periodic table, both atomic mass and atomic number increase from left to right.

The periodic table is a grouping of elements based on their atomic number. Atomic number is the number of protons in an atom. These are the positively charged particles.

The atomic mass is made up of the number of protons and neutrons.

Since the number of protons increase left to right, the atomic mass will also increase.

So, atomic mass and the atomic number increase from left to right.

81 is a composite number.