Question

What is the decimal at the bottom of an element on the periodic table​?

Answer 1

Answer:

Atomic mass

Step-by-step explanation:

That number is the atomic mass of the element. It is also the same numerical value as the molar mass, which is the mass of 1 mole of the element.

So, in this case, sodium (Na) has an atomic mass of 22.99 atomic mass units (amu).

Hope this helps!

Answer 2

Answer:

The atomic mass

Step-by-step explanation:

The decimal at the bottom of an element represents how much one atom of that element weighs.