Question

FIRST IONISATION EMPATHY OF TWO ELEMENTS X AND Y ARE 500 KJ mol^ -1 and 375 kj mol^-1.comment about their relative positions in a group as well as in a period.

Answer 1

The lanthanide and actinide series derive properties from the f-block electrons.

Four elements in the actinide series are naturally occurring, five isotopes of others are occasionally produced by decay of uranium, while the rest of the transuranics have been synthetically produced.

The highest atomic number synthesized to date is 118, the element ununoctium (Uuo).