What is true about valence electrons? they are those electrons that are neutrally chargedthey are those electrons that are found in the nucleusthey are those electrons that are closest to the nucleusthey are those electrons that are furthest from the nucleus

they are those electrons that are furthest from the nucleus.

i think it is d. e because the next one is igneous.

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.