7a probing matter Quiz physics alevel edexcel

The atomic number of an element represents the number of:

• Protons in the nucleus

• Neutrons in the nucleus

• Electrons in the atom

• Nucleons in the nucleus

The neutron number of an atom is equal to the:

• Number of protons

• Number of electrons

• Number of nucleons

• Difference between the mass number and the atomic number

The strong nuclear force is responsible for:

• Holding electrons in orbit around the nucleus

• Binding protons and neutrons together in the nucleus

• Generating electricity within the atom

• Repelling positively charged particles

Chadwick's discovery of the neutron demonstrated that the atomic nucleus contains:

• Positively charged protons

• Negatively charged electrons

• Neutrally charged neutrons

• Alpha particles

A nucleon refers to:

• An electron within the atomic nucleus

• A proton or neutron within the atomic nucleus

• An electron orbiting the nucleus

• A neutrino emitted during beta decay

Thermionic emission is the process by which:

• Electrons are emitted from a metal surface when exposed to light

• Electrons are emitted from a metal surface due to heating

• Protons are emitted from a metal surface due to heating

• Photons are emitted from a metal surface due to heating

Cathode rays were discovered to be:

• Streams of positively charged particles

• Streams of negatively charged particles

• Streams of neutral particles

• Streams of photons

The photoelectric effect refers to the emission of:

• Protons from a metal surface when exposed to light

• Electrons from a metal surface when exposed to light

• Neutrons from a metal surface when exposed to light

• Photons from a metal surface when exposed to light

The mass number of an atom is the sum of its:

• Protons and electrons

• Protons and neutrons

• Neutrons and electrons

• Nucleons and electrons

The electron probability cloud represents:

• The path electrons follow around the nucleus

• The precise location of electrons within an atom

• The likelihood of finding an electron in a particular region around the nucleus

• The energy levels of electrons within an atom