Atoms: What are they made of?

Atoms: What are they made of?

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• Atoms are the basic building blocks of all matter.

• EVERYTHING on Earth is made of atoms…even the air and your body.

​What are atoms?

• ​Protons (+)

• Neutrons (N)

• Electrons (e-)

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​These are called subatomic particles.

​Atoms are made of three particles:

​Protons

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•  Located in the nucleus

•  Have a positive charge

•  Have a mass of one

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Multiple Choice

The proton is located _____.

• in the nucleus of the atom.

• in the electron cloud of the atom.

• in the proton cloud of the atom.

Multiple Choice

What charge does a proton have?

• positive

• negative

• neutral

​Neutrons

• ​Located in the nucleus

• Have no charge

• Have a mass of one, similar to the proton

Multiple Select

Which three statements below are true? Select three.

• Neutrons are located inside the nucleus of an atom.

• Neutrons have a negative charge.

• Protons and neutrons are both located inside the nucleus.

• Protons have a neutral charge.

• Neutrons have a neutral charge.

​Electrons

• ​orbit the nucleus of the atom in the electron cloud

• ​are very small (have basically NO mass)

• ​in a neutral atom, there are the same number of protons and electrons

• ​electrons have a negative charge

Multiple Choice

Electrons are found in the _____

• electron cloud.

• nucleus.

Multiple Choice

Electrons have a _____ charge.

• positive

• negative

• neutral

​What force holds all the parts of an atom together?

​It is the electromagnetic force of attraction between the positive protons in the nucleus and the negative electrons orbiting around the nucleus that holds the atom together.

Multiple Choice

True or False? In a stable (neutral) atom, the protons are equal to the electrons.

• True

• False

Multiple Choice

Which statement is NOT TRUE?

• Protons and electrons have opposite charges.

• Electrons and protons are inside the nucleus of an atom.

• Neutrons have no charge

• Protons have a charge of +1 and electrons have a charge of -1.