Question

in the following diagram, what does the number 12 represent?
diagram: 6 c carbon 12.0 (and part of nitr 14...)
options:
an atomic number
a number of electrons
an atomic mass
a chemical symbol

Explanation:

In the periodic table, the number below the element name and symbol represents the atomic mass (also called atomic weight) of the element. For carbon (C), the number 12.0 (rounded to 12 here) is its atomic mass. The atomic number is the number above the symbol (6 for carbon), the number of electrons in a neutral atom equals the atomic number, and the chemical symbol is "C". So 12 represents the atomic mass.

Answer:

An atomic mass