Which atom is the largest
K
K+
Ca
Ca2+
Li

Explanation:

K: 2, 8, 8, 1 but 19p+

K+: 2, 8, 8 but 19p+

Ca: 2, 8, 8, 2 but 20p+

Ca2+, 2, 8, 8 but 20p+

K and Ca are larger than their corresponding ions because of one more energy level, so Li is the smallest.

K and Ca have the same no. of electron shells but K has less p+ than Ca. so the attraction between electron and p+ in K is less than that in Ca. Therefore, K is larger than Ca.

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.

sorry i was late, but i don't know what assignment your talking about, i'm in flvs as well, im in earth space science. but u are behind pace bc every class should be in the 3's or 4'