The Atom 6th Morel

Around 400 BCE, a Greek philosopher named Democritus (dih·MAHK·rih·tuhs) thought that you would eventually end up with a particle that could not be cut. He called this particle atomos, a Greek word meaning...

• smallest particle

• not able to be divided

• neutron, proton and electron

• electron cloud

People used to think that atoms could not be divided into anything simpler. Scientists now know that atoms are made of even smaller particles. These particles are called...

• protons, neutrons and electrons

• protons, nucleus and electrons

• protons, nucleus, electron clouds

• nucleus, neutrons and electrons

Protons are...

• the negatively charged particles of an atom.

• the negatively charged particles of a proton cloud.

• the positively charged particles of an atom.

• Particles with no charge

The negatively charged particles of an atom are called...

• Proton

• Neutron

• Electron

• nucleus

The positively charged particles of an atom are located in the....

• proton

• nucleus

• neutron

• electron

The negatively charged particles of an atom are located in the...

• nucleus

• proton

• electron

• electron cloud

The charge of a single electron is represented as...

• 1+

• 1-

• 0

• No charge

What particles make up the nucleus of an atom?

• proton and neutrons

• electrons and protons

• electrons and neutrons

• nucleus and protons

The atomic number of an atom is...

• the number of protons in the nucleus of an atom

• the number of electrons in the nucleus of an atom

• The sum of neutrons and protons of an atom

• The number of neutrons in the nucleus of the atom

A magnesium atom has 12 protons in its nucleus. How many electrons does a magnesium atom needs to have in order to have a net charge of 0?

• 6

• 11

• 0

• 12