Practice ATOM and PT

The smallest particle of an element that retains all the properties of that element. Contains protons neutrons and electrons.

• Atom

• Electron

• Proton

• Neutron

A subatomic particle with a charge of negative electricity, found in all atoms.

• Atom

• Electron

• Proton

• Neutron

A subatomic particle occurring in all atomic nuclei, with a positive electric charge.

• Atom

• Electron

• Proton

• Neutron

- the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

• Element

• Nucleus

• Atomic Mass

• Atomic Number

Where in the atom can you find protons?

• In the nucleus

• In the electron cloud

Where in the atom can you find electrons?

• In the nucleus

• In the electron cloud

A Boron atom has 5 protons, 5 electrons and 6 neutrons. What is the mass number for Boron? (Just write the number)

A Helium atom has 2 protons, 2 electrons, and 2 neutrons. What is the Atomic Number for He? (Just write the atomic number)

Look at the picture for gold (Au). How many electrons does a neutral gold atom have? (Just write the number)

Atom model description:
Electrons move freely in energy levels creating a cloud.

• Electron Cloud
• Thompson
• Bohr
• Dalton