how can you use the periodic table to find the number of neutrons in one atom of an element?

the number of neutrons is equal to the number of electrons.

the number of neutrons is equal to the atomic number of the element.

the number of neutrons is equal to the atomic weight of the element.

the number of neutrons is equal to the atomic weight minus the number of protons.

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.