Describe, in detail, the arrangement of the periodic table, and how it compares to some card games. Describe the rows and columns. What do they tell us about the elements in each row or column? What other trends are on the periodic table?

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.

i do not get it   at all

level 4 to level 2 : ))