An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?

• 15

• 31

• 16

• 47

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NGSS.MS-PS1-1

Simple substance made up of only one kind of atom

• Mixture

• Compound

• Atom

• Element

• Molecules

Which statement about atoms is true?

• Atoms combine to make all the substances on Earth.

• Atoms are made up of smaller particles called molecules.

• Atoms come in different sizes, but most are visible using a simple hand lens.

• Atoms combine to make larger subatomic particles.

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NGSS.MS-PS1-1

Which TWO of the following below would represent correct Bohr models?

Pay attention to the number of electrons in each shell.

• A

• B

• C

• D

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Two or more atoms chemically bonded together are called a

• atom
• element
• molecule
• mixture

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How many Protons are in one atom of Lithium?

• 3
• 6
• 7
• 6.941

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Which colored particle is the electron?

• blue

• red

• yellow

• red and yellow

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How many valence electrons ae in the element Carbon?

• 2 electrons

• 6 electrons

• 4 electrons

• None of the above

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NGSS.MS-PS1-1

An atom that has a charge is called...

• A proton

• A neutron

• An ion

• An element

What is the Periodic Table?

• A chart that shows all the elements scientists have discovered/created.

• A chart that lists all the molecules that exist in the universe.

• A chart that tells who discovered each element.

• A chart that lists all the molecules found in nature.