Atomic Structure

Which sub atomic particles are found in the nucleus?

• protons and electrons
• neutrons and electrons
• protons and neutrons

Which particle has a charge of +1?

• proton
• neutron
• electron

Which particle has a charge of -1?

• proton
• neutron
• electron

Which particle has no charge?

• proton
• neutron
• electron

Which particle has a very small or negligible mass?

• proton
• neutron
• electron

Which of these statements is correct?

• In an atom the number of protons is equal to the number of electrons.
• In an atom there are always more neutrons than protons.
• In an atom the number of protons is greater that the number of electrons.

The atomic number of an atom is

• the number of neutrons in an atom
• the number of electrons plus the number of protons in an atom
• the number of protons in an atom

The mass number of an atom is

• the number of protons plus the number of electrons
• the number of neutrons plus the number of electrons
• the number of protons plus the number of neutrons

Isotopes are

• atoms of the same element with the same number of protons and electrons.
• atoms of different elements with different number of neutrons.
• atoms of the same element with the same number of protons but different number of neutrons.

The number of neutrons in an atom equals

• the number of protons plus the number of electrons.
• the mass number minus the atomic number.
• the mass number plus the atomic number.