What is the total mass of 3.01 x 10^23 atoms of helium gas?

2 g

Moles of atom =  atoms / 6.022 × 10^23  

Therefore; number of moles;

=(3.01 ×10^23) / (6.022 × 10^23)

= 0.5 moles

But;

Mass = moles of atom × Molar Mass of Helium  

Thus total mass of helium:

= 0.5 × 4

= 2 g

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i