Element X has a nucleon (mass) number of 19 and a proton (atomic) number of 9. Which group does X belong in? Choose one of the following and explain the answer. a) I b) III c) VII d) 0

C

Explanation:

Flourine has

9 protons

9 electrons

10 neutrons

this makes the atomic number 9 and the atomic weight 19.

hope it helps

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3