Chemical Combination

The number of known elements u till now is .................... elements.

• 92

• 118

• 121

• 211

All metals are solid elements, except .................

• sodium

• magnesium

• mercury

• aluminium

Oxygen is from ....................

• metal elements

• nonmetal elements

When an atom of an element loses one electron or more, it changes into a.................

• negative ion

• positive ion

• neutral atom

• no correct answer

All of nonmetals don't conduct electricity, except ..................

• bromine

• aluminium

• graphite

• mercury

All of these elements can participate in chemical reactions, except ....................

• sodium

• neon

• hydrogen

• nitrogen

Nonmetals have more than 4 electrons in their outer shells.

• True

• False

The molecules of noble gases are diatomic molecules.

• True

• False