Atomic structure

Proton has a positive charge,electron has a negative charge, neutron has no charge.

• True

• False

A molecule of an element composed of only one atom is known as:

• Monoatomic molecule

• Diatomic molecule

• Triatomic molecule

• Polyatomic molecule

Fluorine atomic number:

Name the subatomic particles in the center:

• Electrons and neutrons

• Protons and neutrons

• Electrons and protons

Formula of carbon monoxide

• CO

• Co²

• co

Formula of Calcium nitrate :

• Ca(NO³)²

• Ca²(NO) ³

• Ca²(NO³)

Sulphur is an example of :

• Monoatomic molecule

• Diatomic molecule

• Triatomic molecule

• Polyatomic molecule

The positive charges ions are called:

• Cations

• Anions

Who classified elements systematically in a table called Modern periodic table?

• Dimitri Mandeleff

• John Dalton

• Goldstein

• Rutherford

Noble gases have valency :