Basic Atomic Structure Quiz PS

What is the atomic number of an element?

• The sum of protons and neutrons

• The number of protons in the nucleus

• The total number of electrons

• The average mass of all isotopes

Atoms of the same element with different numbers of neutrons are called:

• Ions

• Isotopes

• Molecules

• Compounds

The subatomic particle with no electrical charge is the:

• Electron

• Proton

• Neutron

• Nucleus

In modern atomic theory, electrons:

• Can be found at any distance from the nucleus

• Are located in exact positions around the nucleus

• Can only be found in certain energy levels

• Move in perfect circular orbits

The mass number equals the number of protons plus the number of neutrons.

• True

• False

All isotopes of an element have the same number of protons.

• True

• False

Match the following

• Nucleus

• A negatively charged subatomic particle

• Atomic number

• The positively charged central part of an atom

• Proton

• A positively charged subatomic particle

• Electron

• The number of protons in an atom