Chemistry Exam Review #5

Which isotope has the greatest number of protons?

• Pa-238

• U-240

• Np-238

• Pu-239

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A neutral atom of a certain element has the electron configuration 1s²2s²2p⁶3s²3p⁴. How many valence electrons does the atom have?

• 4

• 6

• 11

• 16

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NGSS.HS-PS1-1

The equation above represents the radioactive decay of a gold isotope.

Which choice correctly completes this equation?

• alpha particle

• beta particle

• photon

• neutron

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A neutral atom has a ground state electron configuration of 1s²2s²2p⁶3s². The neutral atom becomes an ion during a chemical reactin. Which is the most likely charge of the ion?

• 2+

• 1+

• 2-

• 6-

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How many electrons are in the outermost energy level of a neutral carbon atom?

• 2

• 4

• 6

• 8

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The compound sodium chloride is placed in water and separates into ions. What are the correct names for these ions?

• The chloride and sodium ions are cations.

• The chloride and sodium ions are anions.

• The sodium ion is the anion, and the chloride ion is the cation.

• The sodium ion is the cation, and the chloride ion is the anion.

Which element will form covalent bonds with chlorine?

• carbon

• aluminum

• magnesium

• potassium

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Which type of bonding or intermolecular forces is/are weakest?

• London dispersion forces

• hydrogen bonding

• dipole-dipole forces

• covalent bonding

What is the chemical formula for chromium(III) oxide?

• CrO

• CrO₂

• Cr₂O₃

• Cr₃O₂

Test results on two white crystalline solids are shown in the table above. Based on the information in the table, what can be concluded?

• Both solids contain only ionic bonds.

• Both solids contain only covalent bonds.

• Solid X contains only covalent bonds, and Solid Y contains only ionic bonds.

• Solid X contains only ionic bonds, and Solid Y contains only covalent bonds.

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