The vertical columns in the periodic table are called

The elementsin the group number 18 are known as

Elements of the second period show resemblance in properties with elements of third period of the next group leading to a

According to modern periodic law, the physical and chemical properties of elements are periodic functions of their

The horizontal rows in the periodic table are called

_______________ are weak metals and metalloids.

_______________ is the distance between the centre of the nucleus and the outermost shell.

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

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