Choose the correct answer from the options given below:
Ionisation potential increases over a period  from left to right because the:

• Atomic radius increases and nuclear charge increases.

• Atomic radius decreases and nuclear charge decreases

• Atomic radius increases and nuclear charge decreases

• Atomic radius decreases and nuclear charge increases.

If an element A belong to period 3 and group II then it will have:

• 3 shells and 2 valence electrons

• 2 shells and 3valence electrons

• 3 shells and 3 valence electrons

• 2 shells and 2 valence electrons

Give one word or phrase for the following :
The amount of energy released when an atom in the gaseous state accepts an electron to form an anion.

Choose the correct answer from the options given below:
A compound X consists of only molecules. Hence X will have.

• A crystalline hard structure

• A low melting point and low boiling point

•  An ionic bond

• A strong force of attraction between its molecules

The molecules containing a triple covalent bond is

• Ammonia

• Methane

• Water

• Nitrogen