Group IIB and know that this means the group of elements zinc,
cadmium and mercury, whilst Group I1A refers to the alkaline earth
metals beryllium, magnesium, calcium, barium and strontium.
When Mendeleef devised his periodic table the noble gases were
unknown. Strictly, their properties indicate that they form a group
beyond the halogens. Mendeleef had already used "Group VIIF to
describe his "transitional triads' and the noble gases were therefore
placed in a new Group O.
Group IIB and know that this means the group of elements zinc,cadmium and mercury, whilst Group I1A refers to the alkaline earthmetals beryllium, magnesium, calcium, barium and strontium.When Mendeleef devised his periodic table the noble gases wereunknown. Strictly, their properties indicate that they form a groupbeyond the halogens. Mendeleef had already used "Group VIIF todescribe his "transitional triads' and the noble gases were thereforeplaced in a new Group O.
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