Chlorine
Two stable ones, 10 & 11. Several unstable.
Natural gallium has 2 stable isotopes
Helium 3 and helium 4 are naturally occurring isotopes 5 thru 10 are exotic isotopes.
Hydrogen-1 isotopes have one proton and no neutrons. Hydrogen-2 isotopes have one proton and one neutron.
2
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No
Beryllium is a member of group 2, an Alkaline Earth Metal.
Two stable ones, 10 & 11. Several unstable.
Natural gallium has 2 stable isotopes
well actually you can't delete the group but you can: if you wanna just let the last member be in charge 1. go to the group 2. then click leave group 3. it will notify you that the last member will be in charge if you want the group just to be deleted 1. delete all the members 2. then go to edit 3. then click leave group 4. it will notify you that since you were the only member left the group will be deleted
copper has 2 stable isotopes
Hydrogen-1 and hydrogen-2 isotopes are radioactively stable.
Fluorine has 2 natural isotopes, 16 artificial isotopes and 1 artificial isomer.
by helping and cloning
Hydrogen-1 and hydrogen-2 isotopes are radioactively stable.
Helium 3 and helium 4 are naturally occurring isotopes 5 thru 10 are exotic isotopes.