What is an element? select one: a. two or more atoms held together by chemical bonds b. a chemical that cannot be broken down or separated into other chemicals c. a chemical that can be broken down or separated into other chemicals d. one or more molecules held together by chemicals e. a chemical that cannot be separated, but is limited in supply?

an element is a the smallest substance that cannot be broken down so the answer is B.

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.