The basis of modern periodic law is______.

_____ group contains the member of

halogen family.

_____ is a relative periodic property

Chemical formula of rust is ________.

In the alumino thermic process the role of

Al is _____.

The process of coating the surface of metal

with a thin layer of zinc is called______.

Which of the following have inert gases

2 electrons in the outermost shell.

Neon shows zero electron affinity due to

_____.

______ is an important metal to form

amalgam.