Questions

A glass bridge at Rajgir in Bihar is the first glass bridge in India.

Nelson Mandela and Frederik Willem de Klerk has won the Nobel Peace Prize in 1993 for their work for the peaceful termination of the apartheid regime, and for laying the foundations for a new democratic South Africa.

Its a Needle. Needle has an eye but can't see.

Ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms. Atoms are more stable when they have full valence shells.

The ionization energy decreases from top to bottom in groups, and increases from left to right across a period.

HGence, in this trend Francium (Fr) has the lowest ionization energy.

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

Examples of compounds with covalent bonds ::

HCl, CO2, O2,...