4. explain why do elements in groups share more chemical properties than
elements in a period?

The tend to share the same number of outer electrons. Halogens, for example all have 7 outer electrons, and therefore there oxidation number is -1.

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.

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.