atoms and molecules

Question 1

hydrogen (atomic no=1) atomic mass? symbol?

Answer 1

atomic mass=1(rule doesn’t apply) symbol=H

Question 2

helium (atomic no =2) atomic mass? symbol?

Answer 2

mass 2*2=4 (rule applies) symbol=He

Question 3

lithium (atomic no=3 )atomic mass symbol?

Answer 3

mass= 3*2+1=7 (odd rule applies) symbol=Li

Question 4

beryylium (atomic no=4) atomic mass symbol

Answer 4

mass= 4*2+1= 9 symbol= Be

Question 5

boron (atomic no=5) atomic mass and symbol

Answer 5

mass= 5*2=10 symbol=B

Question 6

carbon (atomic no=6) mass symbol

Answer 6

mass=6*2=12 symbol=C

Question 7

nitrogen(atomic no= 7) mass symbol

Answer 7

mass=7*2=14 symbol= N

Question 8

oxygen(atomic no= 8) mass symbol

Answer 8

mass=8*2=16 symbol=O

Question 9

fluorine (atomic no= 9) mass symbol

Answer 9

mass= (9*2= 18 symbol=F

Question 10

neon (atomic no=10) mass symbol

Answer 10

mass=10*2=20 symbol=Ne