Question

question 5
what does the atomic number of an element tell you?
the color of the elements symbol
the number of atoms in a sample
the total weight of the atom
the number of protons in the nucleus
question 6
why is it helpful for engineers to understand the periodic table?
it helps them pick the right materials for specific jobs

Explanation:

The atomic number of an element is defined as the number of protons in the nucleus of an atom of that element. It is a fundamental property used to identify and classify elements. The other options are incorrect: the color of the element's symbol is not related to the atomic number; the number of atoms in a sample depends on the amount of substance (not the atomic number); and the total weight of the atom (atomic mass) is related to protons and neutrons, not just protons (which is what atomic number represents).

Answer:

The number of protons in the nucleus