If an atom has 43 electrons, 56 neutrons, and 43 protons, what is the
approxiamate atomic mass?  What is the name of this element?

Hi!!
The atomic number corresponds to the number of protons in the nucleus
of an atom of that element. It also corresponds to the number of
electrons in the neutral atom. Then if an atom has 43 protons, its
atomic number is 43. The atomic number determines which element an
atom is.
Searching in a periodic table we find that the element with atomic
number 43 is the Technetium (Tc).

The approximated atomic mass of an isotope of an element is given by
the number of protons plus the number of neutrons of the isotope. If
our Tc atom has 43 electrons, 56 neutrons, and 43 protons, it has an
approximated atomic mass of 56+43 = 99. (The most common and stable
isotope of Tc has an atomic mass of 98).


I hope that this helps you. Feel free to request for a clarification
if you need it.

Regards.
livioflores-ga