Question

According to IUPAC recommendations, the number of groups in Long form of the periodic table is __________

Answer 1

Groups 1-2 (except hydrogen) and 13-18 are termed main group elements.

Groups 3-11 are termed transition elements. Transition elements are those whose atoms have an incomplete d-subshell or whose cations have an incomplete d-subshell.

Main group elements in the first two rows of the table are called typical elements.

The first row of the f-block elements are called lanthanoids (or, less desirably, lanthanides. The second row of the f-block elements are called actanoids (or, less desirably, actanides.

The following names for specific groups in the periodic table are in common use:

• Group 1: alkali metals
• Group 2: alkaline earth metals
• Group 11: coinage metals (not an IUPAC approved name)
• Group 15: pnictogens (not an IUPAC approved name)
• Group 16: chalcogens
• Group 17: halogens
• Group 18: noble gases