PS. 2/4 Unit Test Review

• An atom contains protons, neutrons and electrons.

• An atom's nucleus is small and has a positive charge

• Electrons follow a predictable path around the nucleus

• Different isotopes of an element have different masses.

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NGSS.MS-PS1-1

Which statement best describes the density of an atom's nucleus?

• The nucleus occupies most of the atom's volume but contains little of its mass

• The nucleus occupies very little of the atom's volume and contains little of its mass

• The nucleus occupies most of the atom's volume and contains most of its mass

• The nucleus occupies very little of the atom's volume but contains most of its mass.

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Which best describes the current model of an atom?

• A solid sphere with electrons and protons embedded

• A solid sphere unique for everything that exists

• A central nucleus containing protons and neutrons with electrons orbiting in levels of high probability

• A central nucleus containing protons with electrons orbiting in specific paths

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Correctly match the part of an atom to its appropriate charge.

• Negative Charge

• Protons

• No Charge

• Electrons

• Positive Charge

• Neutrons

What is the atomic number of Carbon-14?

• 6

• 7

• 12

• 14

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Which statement best describes the alkaline earth elements?

• They have one valence electron, and they form ions with a 1+ charge.

• They have one valence electron, and they form ions with a 1- charge.

• They have two valence electrons and they form ions with 2+ charge.

• They have two valence electrons, and they form ions with a 2- charge.

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Which symbol represents an alkaline earth element?

• Na

• Mg

• Ne

• Ag

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NGSS.MS-PS1-1

Which compound contains an alkali metal and a halogen?

• CaCl₂

• CaS

• RbCl

• Rb₂S

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NGSS.MS-PS1-1

In which group of elements do the atoms gain electrons most readily?

• 1

• 2

• 17

• 18

Which group shown contains elements with the greatest variation in chemical properties?

• Li, Be, B

• Li, Na, K

• B, Al, Ga

• Be, Mg, Ca