Helium is under group 18 and period 1. This makes helium a noble gas with the most electrons it can possibly have under stable conditions.
carbon (group 14, period 2) hydrogen (group 1, period 1) nitrogen (group 15, period 2) oxygen (group 16, period 2) sulphur (group 16, period 3) halogens (group 17, period 2-5)
Group number 12, period number 4 Transition metal
Calcium is present in period 4. its group no. is 2
the group is 18
Oxygen belongs to the chalcogens family.
Carbon is in group 14, period 2
Xenon is a noble gas. It belongs to group 18 and period 5.
Argon is in group 0 period 3
Group 1, Period 3
Group 0 Period 5
Group 18, period 5.
carbon (group 14, period 2) hydrogen (group 1, period 1) nitrogen (group 15, period 2) oxygen (group 16, period 2) sulphur (group 16, period 3) halogens (group 17, period 2-5)
Group 7 Period 5
Period 4 Group 8
Germanium is in period 4 and group 4A or 14.
6th group 3rd period
Sulfur is in period 3 and group 16 (6A).