Matter & Atoms - Lesson 1 2025

Multiple Choice

Which statement best describes matter?

• Anything that has mass and takes up space

• Anything that can be seen

• Anything that is a liquid

• Anything that is alive

While watching, think about this:
What is the smallest unit we can cut everything around us down to?

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PAUSE! LET'S WATCH THE BRAINPOP

Multiple Choice

Why has the model of an atom changed over time?

• Scientists discovered new evidence about atoms over time.

• Scientists couldn't agree on what the atom looked like.
• Atoms today are different than they were for Democritus in Greece.
• Atoms are always changing and may be different in the future.

Match

Match the subatomic particle to their correct description.

• +1

• 0

• -1

Proton

Neutron

Electron

• Proton

• Neutron

• Electron

Hotspot

Look at the following atom. Click on the NUCLEUS.

Hotspot

Look at the following atom. Click on the ELECTRON.

Multiple Select

Select all statements that are true about the nucleus of an atom.

• It contains protons and neutrons.

• It is located at the center of the atom.

• It contains electrons.

• It is densely packed.

Open Ended

Explain why the atomic model shown is considered a poor representation of an atom. (10 words or less)

Multiple Choice

What property distinguishes atoms of one element from atoms of another?

• Number of protons

• Number of neutrons

• Number of electrons

• Size of nucleus

Fill in the Blanks

Multiple Choice

What does the atomic mass of an element represent?

• The number of protons and neutrons in an atom's nucleus

• The number of electrons in an atom

• The number of protons in an atom

• The number of neutrons in an atom

Fill in the Blanks

Make sure your notes are done!

​Matter, Atom, Atomic Theory, Subatomic Particles, Proton, Neutron, Electron, Nucleus, Electron Cloud, Atomic Number, Atomic Mass

Go through your notes and make sure the following vocab is highlighted!

Multiple Choice

SSA Practice #1: Kamara was examining a model of an unknown atom, shown below. Which description best describes the structure shown as “X” in the diagram?

• It is the electron cloud, which contains all of the protons and electrons of the atom.

• It is the nucleus, which contains all of the protons and neutrons of the atom.

• It is the electrons cloud, which contains all of the electrons of the atom.

• It is the nucleus, which contains all of the protons of the atom.

Multiple Choice

SSA Practice #2: Which table below correctly identifies the properties of subatomic particles within the atom?

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