chemical combinations

Atoms of…… ………….tend to lose an electron or more during the chemical reaction and changes into……………..

• metals , positive ion

• non-metals , positive ions

• metals , negative ions

• non-metals , negative ions

In the double covalent bond, each atom shares with……….... electrons

• 1

• 2

• 3

• 4

Covalent bond is formed among two……………elements

• metal

• non-metals

• inert

The types of covalent bonds are………………, ……………. And…………………….

• single

• double

• triple

• ionic

In…………..element, the atoms don't lose or gain any electrons.

• metal

• non-metals

• inert

The number of electrons in oxygen ion is……………..electrons

• 2

• 6

• 8

• 10

The number of electrons in oxygen ion is……………..electrons

• 2

• 6

• 8

• 10

give reason

The bond in the hydrogen molecule is a single covalent bond

• because each atom shares the other atom with one electron.

• because each atom shares the other atom with two electrons.

• because each atom shares the other atom with three electrons.

All metals are solids except………………which is a liquid.

• lead

• bromine

• mercury

• gold

All non -metals are solids except………………which is a liquid.

• lead

• bromine

• mercury

• gold