give the number of valence electrons
a/ hydrogen
b/ oxygen
c/aluminium
d/ carbon
e/ chlorine
a/ hydrogen: 1
b/ oxygen: 6
c/ aluminium: 3
d/ carbon: 4
e/ chlorine: 7
a/ Hydrogen: Hydrogen has 1 valence electron.
b/ Oxygen: Oxygen has 6 valence electrons.
c/ Aluminium: Aluminium has 3 valence electrons.
d/ Carbon: Carbon has 4 valence electrons.
e/ Chlorine: Chlorine has 7 valence electrons.