Atoms

Which statement gives a correct indication of the size of atoms?

• A bacterium is about 10000 times larger than an atom.

• Atoms are 10 times smaller that dust particles.

• An atom is the size of a full stop.

• An atom is the size of a red blood cell.

Which of the following only contains one kind of atom?

• Pure water

• Salt

• Gold

• Dust

What is the proton number?

• The number of protons in an atom.

• The number of electrons in an atom.

• The number of neutrons in an atom.

• None of the above.

What is another name for proton number?

• electron number

• mass number

• nucleon number

• atomic number

What is the mass number?

• The number of protons and electrons.

• The number of protons and neutrons.

• The number of neutrons and electrons.

• The number of protons, electrons and neutrons.

What is another name for mass number?

• neutron number

• nucleon number

• atomic number

• proton number

This is a carbon atom. What sub-atomic particles are found in the nucleus of the atom?

• electrons

• protons

• protons and neutrons

• protons and electrons

The picture shows element X. Which of the following statement is false?

• X has 7 protons.

• X has 7 electrons.

• The mass number of X is 14.

• The number of neutrons is 14.

Look at the carbon atom. How many electrons does it contain?

• 2

• 6

• 12

• 18

Look at the chemical symbol of phosphorus. What is the number of neutrons of phosphorus atom?

• 15

• 16

• 31

• 46