Groups
Main article: Group (periodic table)
14 elements were group IVA). In Europe,the lettering was similar,except that”A”was used if grup 10,and “B” was used for group including and after Under an international naming convention,the groups are numbered numerically from l to 18 from the leftmost column (the alkali metals) to the rightmost column(the noble gases). Previously,they were known by roman numerals. In America,the roman numerals were followed by either an “A” if the group was in the s-or p-block, or a “B” if the group was in the d-block.the roman numerals used correspond to the last digit of today’s naming convention (e.d.the group 4 elements were group IVB, and the group group 10. IN addition,groups 8,9 and 10 used to be treated as one triple-sized group,known collectively in both notations as group VIII.in 1988,the new IUPAC naming system was put into use,and the old group names were deprecatedthe group was before.