An element has a mass of 207 and 125 neutrons in its nucleus. How many protons & electrons does it have & where are they located?

The number of protons can be calculated by subtracting 207 with 125

Therefore, proton no. : 207 - 125

                                    = 32

Proton number and electron number is always equivalent, so there are 32 electrons in the electron shells

Protons and neutrons are always located in the nucleus of an atom, and electrons are located in the electron shells which always move rapidly around the atom

The element which is referred is Lead(Pb)

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.