The electron configuration of a neutral elerpent is 1s 2s 2p 3s. If the electron configuration for the ion of the same element is 1s 2s2pº, select the symbol with charge of the lon.
Ne
Oь
Ne 2
Ос
Mg?
Mg?

Ne 2

Explanation:

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.