Atoms Retake

1. What is the symbol for an Aluminum ion?

• Al

• Al³⁺

• Al^3-

• Al₃

Why is an atom neutral?

• It has an equal number of neutrons and quarks.

• It has an equal number of neutrons and electrons.

• It has an equal number of protons and electrons.

• It has an equal number of protons and neutrons.

The nucleus of an atom is surrounded by ?

• a neutron cloud.

• an electron cloud.

• rings of orbiting protons.

• rings of orbiting neutrons.

The picture above represents an atom and its subatomic particles.

Which letter in the picture represents an electron?

• W

• X

• Y

• Z

Two atoms each contain 6 protons, but one has 6 neutrons and the other has 8 neutrons. What are these atoms called?

• binaries

• isotopes

• ions

• radicals

Isotopes of an element have the same

• mass number

• atomic number

• number of nucleons

• number of neutrons

An atom of silicon (Si) contains how many electrons?

• 7

• 14

• 16

• 28

What must an object gain or lose to become electrically charged?

• protons

• electrons

• neutron

• nucleus

Erika is asked to create a model showing a negatively charged Carbon ion. Which model should she create?

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An element's periodic table identity is defined by its number of

• protons

• neutrons

• isotopes

• electrons