________arranged elements in increasing order of atomic weights in series of eight.

______________ is the amount of energy required to remove an electron from the outermost shell of an isolated atom.

_________are placed in the upper right hand corner of the modern periodic law.

________________ are good reducing agents.

The elements in the group number 17 are known as

__________________ lie at the centre of the periodic table between metals on the left and non-metals on the right.

First group elements are commonly known as

Elements from group 3 to group 12 are collectively known as

The properties which repeat themselves at regular intervals are called

_______________ arranged elements in increasing order of atomic weights in the form of a table called the periodic table.