Chemistry Final Review 4

H
H₂
NaCl
Cl
O_{2
List the correct answers in order.}

• molecule, compound, molecule, element,molecule
• element, molecule, compound, compound, molecule
• element, molecule, compound, element, molecule
• Compound, element, ,molecule, vector, roger

1) Which isotope has the greatest number of protons?

• Pa-238

• U-240

• Np-238

• Pu-239

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

• 4

• 6

• 11

• 16

3) What color of light does a hydrogen atom emit when an electron transitions from the n=6 energy level to the n=2 energy level?

• orange

• yellow

• blue

• violet

4) The equation below represents the radioactive decay of a gold isotope.

¹⁷⁴ ₇₉ Au →¹⁷⁰₇₇ Ir + ?

Which choice correctly completes this equation?

• alpha particle

• beta particle

• photon

• neutron

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

• 2

• 4

• 6

• 8

7) 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.

8) Which element will form covalent bonds with chlorine?

• carbon

• aluminum

• magnesium

• potassium

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

• CrO

• CrO₂

• Cr₂O₃

• Cr₃O₂

15) What is the order of the elements from smallest to largest atomic radius?

• Element 1, Element 2, Element 3

• Element 1, Element 3, Element 2

• Element 2, Element 1, Element 3

• Element 2, Element 3, Element 1