The smallest unit of matter is _________.

• atom

• cell

• electron

• element

It is the smallest particle of an element or compound that can exist independently.

• atom

• electron

• molecule

• proton

What property of matter is the measure of the amount of matter the object has?

• elasticity

• mass

• volume

• weight

What property of matter is the measure of the space occupied by an object?

• elasticity

• mass

• volume

• weight

Jewelry pieces (like rings and necklaces) made of gold have shiny appearance. This property of metal is called ____________.

• ductility

• electrical conductivity

• luster

• malleability

Electrical wirings used in our household are made of copper wires. This property of metals that can be drawn into fine wires is called ____________.

• ductility

• luster

• electrical conductivity

• malleability

The property of material to let heat pass through it is called ____________?

• ductility

• luster

• electrical conductivity

• thermal conductivity

Who first proposed ideas about atoms?

• Aristotle

• J. J. Thomson

• John Dalton and Ernest Rutherford

• Leucippus and Democritus

Who presented concrete evidence that all matter is made of very small particles called atoms?

• Aristotle

• Democritus

• J. J. Thomson

• John Dalton

The size of an atom is measured in ____________.

• angstroms

• centimeters

• millimetres

• nanometers