Sodium and potassium are
soft metals
hard metals
non metals
none of these
H2 is
Mono atomic
Di atomic
Tri atomic
Poly atomic
________ are good conductors of heat and electricity.
Non - metals
Metals
Metalloids
Noble Gases
_______ represents the element hydrogen.
N
O
H
I
_______ emit radiations which may be harmful.
Radio active elements
Non metals
Elements and Compounds are ______ substances.
Impure
Pure
Hetrogenous
Mixed
_______ do not react chemically with other elements or compounds.
A non - metal which is a good conductor of heat and electricity is
Graphite
Chlorine
Oxygen
Phosphorous
The number of atoms of an element that can join together to form a molecule of that element is known
Radio activity
Atomicity
Ionisation
Attractivity
________ are inert gases.