AQA Atomic Structure Physics

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Most of the mass in an atom is made up of _____________________?

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

In which way are protons and electrons the same in an atom?

• same mass

• same number of particles

• same charges

The mass number of an isotope is equal to the number of Protons + Neutrons in an atom.

• Protons

• Neutrons

• Protons + Neutrons

•  Electrons

Which subatomic particle determines the identity of an element?

• protons

• neutrons

• electrons

The electron is not included in the calculations for the atomic mass because

• It has negative charge

• It is located in the outer energy levels of the atom

• Its mass is basically zero

• It attracts neutral particles

What is an isotope?

• An atom of an element with a different number of neutrons

• An atom of an element with a different number of protons

• An atom of an element with a different number of electrons

What is radioactive decay?

• An unstable nucleus breaks down to become more stable, giving off radiation

• An unstable atom breaks down to become more stable, giving off radiation

• An unstable element breaks down to become more stable, giving off radiation

• An unstable compound breaks down to become more stable, giving off radiation

What is activity?

• The rate that nuclei decay

• The rate that ions decay

• The rate that protons decay

• The rate that electrons decay

What is the unit of activity?

• Becquerels (Bq)

• Coulombs (C)

• Hertz (Hz)

• Pascals (Pa)