If an atom has 43 electrons, 56 neutrons & 43 protons, what is its approx atomic mass & what is it an atom of?

Answer 1

Because the atom has 43 protons and 43 electrons, it would be Technetium, #43 on the periodic table
by adding its #neutrons and protons together you could calculate that the approx. atomic weight is 99 amu
however, you could find the approximate atomic weight on the periodic table too, which would be 98 amu

Answer 2

The 43 protons denote it as an atom of technetium, regardless of other numbers. Also, 43 + 56 = 99

Answer 3

for the purposes of this question electrons can be taken to have no mass.

Protons and Nuetrons weigh the same.

Therefore, the atomic mass of your atom is 56+ 43 = 99 atomic units.
The atom is identified by the number of protons it has, this atom has atom number 43. Looking at the periodic table, atmoic number 43 corresponds to the element Technetium.

Answer 4

Atomic number = number of protons = 43, thus it is an atom of Technitium (Tc)

Atomic Mass = number of protons + number of neutrons = 43+56 = 99

So what you have is an atom of the Technitium 99 isotope.