Exam review

The smallest particle of a substance that is made up of two or more atoms that are the same or different.

• Atom

• Molecule

• Compound

• Element

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NGSS.MS-PS1-1

The smallest particle of any pure element is also known as the building block of matter.

• Atom

• Molecule

• Compound

• Element

A substance that cannot be broken down by simple chemical and physical processes. It contains the same type of atom.

• Molecule

• Compound

• Element

• Mixture

A chemical substance that is made up of two or more different kinds of atoms bonded together.

• Atom

• Molecule

• Compound

• Element

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NGSS.MS-PS1-1

Which subatomic particle of an atom has a positive charge?

• Proton

• Neutron

• Electron

Which subatomic particle of an atom has a neutral charge?

• Proton

• Neutron

• Electron

Which subatomic particle of an atom has a negative electrical charge?

• Proton

• Neutron

• Electron

Which scientist organized the periodic table of elements?

• John Dalton

• Dmitri Mendeleev

• Isaac Newton

What does the atomic number of an element represent?

• The number of protons in the atom

• The number of electrons in the atom

• The number of neutrons in the atom

What is the difference between molecules and compounds?

• Molecules are made up of two or more atoms that are the same, compounds are made up of two or more atoms that are different.

• Molecules are made up of two or more atoms that are the same or different, and compounds are made up of two or more atoms that are different.

• Molecules make up compounds.

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NGSS.MS-PS1-1