Module 1 Study Guide: The Structure of Atoms

1. A(n) __________ is the smallest unit of matter that makes up an element.

• atom

• molecule

• cell

• proton

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NGSS.MS-PS1-1

When an atom gains an electron, the result is that

• the atom’s mass will decrease.

• the atom will also gain a proton.

• the atom will have a negative charge.

• the atom will become a new element.

Select the answer choice that correctly describes a subatomic particle.

• Neutrons have a large mass, are found in the nucleus and have a negative charge.

• Protons have a small mass, are found in the nucleus and have a positive charge.

• Electrons have a large mass, are found in the electron cloud and have no charge.

• Protons have a large mass, are found in the nucleus and have a positive charge.

What is the net (overall) charge of this nitrogen atom?

• +7

• +14

• -7

• -3

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NGSS.MS-PS1-1

Early models of the atom did not include smaller subatomic particles. Which statement probably explains why those particles were not included?

• Some atoms don’t contain subatomic particles.

• The technology of the time wasn’t good enough to detect subatomic particles.

• Atoms did not develop subatomic particles until the 1950’s.

• Subatomic particles move too fast and couldn’t be seen.

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NGSS.HS-PS1-4

NGSS.HS-PS1-8

Where would you find a neutron in this model?

• Between the nucleus and the first orbit

• On the outside orbit

• On the inside orbit.

• Inside the nucleus.

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NGSS.MS-PS1-1

If an atom has more electrons than protons, the atom has a (a)   charge.

• positive

• negative

• neutral

• radioactive

If an atom has more protons than electrons, the atom has a (a)   charge.

• negative
• positive
• neutral

• radioactive

How many valence electrons would a neutral atom of nitrogen have?

• 7

• 6

• 5

• 2

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NGSS.MS-PS1-1

Complete the graphic organizer using the provided word list.

a

b

c

d

e

f

Element

Pure Substance

Homogeneous Mixture

Compound

Mixture

Heterogeneous Mixture