Questions

The air around us is a mixture of gases, mainly nitrogen and oxygen, but containing much smaller amounts of water and other gases.

Earth's atmosphere is composed of many gases. Their percentages by volume is given by::

 
78% Nitrogen,

21% Oxygen,

0.9% Argon, and

0.03% Carbon dioxide 

And very small percentages of other elements.

Members of the House of Representatives serve two-year terms and are considered for reelection every even year.

The Shramjeevi Train is a daily superfast express train of Indian Railways, running between Rajgir, near Nalanda, Bihar, and New Delhi, the capital city of India. Previously it was running between Patna and New Delhi, later extended to Rajgir.

Atoms are composed of three main particles called electrons, protons and neutrons. We know that, the electrons are negatively charged particles whereas protons are positively charged and neutrons have no charge.

Hence, as the number of electrons and protons are equal and they are oppositely charged, the atom will have no charge as their charges cancel each other.