Electron theory

An Atom consists of protons neutrons and electrons

• True

• False

An atom is larger than an element

• True

• False

An unknown element has an atomic number of 13 and atomic mass of 23. How many electrons it has?

• 3

• 10

• 13

• 23

An unknown element has an atomic number of 13 and atomic mass of 23.How many neutrons it has?

• 3

• 10

• 13

• 23

An unknown element has an atomic number of 13 and atomic mass of 23.How many valence electrons it has?

• 3

• 10

• 13

• 23

The law of charges states

Like charges attract while different charges repel

• True

• False

Which material is an example of an insulator?

• copper

• silver

• mica

• aluminnium

Select the basic methods of producing electricity

• Magnetism

• Pressure

• Piezo

• All the above

A material with an atomic number of 10 is a/an____________.

• Conductor

• Insulator

• Semiconductor

• All the above

Electrons are negatively charged

• True

• False