chemical bonding

Which of the following is NOT true of electrovalent compounds?

• They are solids

• They do not vaporize easily

• They conduct electricity

• The elements forming the compounds normally have their valence electrons in shared state

Helium atoms are chemically unreactive because

• There are no electrons around the nucleus

• The Number of protons equals the number of electrons

• There are equal number of protons and neutrons in the nucleus

• The outer electron shell is completely filled

The weakest attractive forces that can be observed between two molecules is

• Ionic

• Covalent

• Coordinate

• VVan Der waals

An element will readily form an electrovalent compound if it's electronic configuration is

• 2,8,8

• 2,8,4

• 2,8,5

• 2,8,1

How many lone pairs of electron are there on the central atom of the H2O molecule?

• 1

• 2

• 3

• 4