Pre$AP Chemistry 11 Atomic Theory Practice Test Name: Date: Block: Multiple Choice. ________ 1. If two atoms of Ca have different number of electrons, but the same number of protons and neutrons, which property(ies) would be significantly different? A. Mass B. Charge C. Both A & B ________ 2. If two atoms of Na have different number of neutrons, but the same number of protons and electrons, which property(ies) would be significantly different? A. Mass B. Charge C. Both A & B ________ 3. Which of the following ions will NOT have the same electron configuration as Ne? A. Na B. Al 3+ C. Ar D. O 2L ________ 4. Which element has a partiallyLfilled f subshell? A. Ba B. Eu C. Re D. Bi ________ 5. What is the electron configuration of the Co 3+ ion? A. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 6 B. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 4 4s 2 C. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 5 4s 1 D. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 7 4s 2 ________ 6. Based on its electron configuration, the element that is most similar in chemical properties to selenium is: A. As B. Cl C. Sb D. Te ________ 7. Which of these electron diagrams could represent the ground state of the p valence electrons of carbon? 8. Explain your answer to the question above: ________ 9. Which atom or ion has the following electron arrangement? 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 3d 10 A. Cu B. Cu 2+ C. Zn D. Zn 2+ ________ 10. Which of the following best explains the relative positioning and intensity of the 2s peaks in the following spectra? A. Be has a greater nuclear charge than Li and more electrons in the 2s orbital. B. Be electrons experience greater electronLelectron repulsions than Li electrons. C. Li has a greater pull from the nucleus on the 2s electrons ,so they are harder to remove. D. Li has greater electron shielding by the 1s orbital, so the 2s electrons are easier to remove.
A. The!peak!to!the!right!represents!electrons!in!the!1s!orbital!because!electrons!in!lower!energy!shells!have!shorter!peaks.!
B. The!peak!to!the!right!represents!electrons!in!the!1s!orbital!because!electrons!in!lower!energy!levels!are!closer!to!and!more!attracted!to!the!nucleus.!
C. The!right!peak!represents!electrons!in!the!2s!orbital!because!electrons!in!high!energy!shells!have!shorter!peaks.!
D. The!right!peak!represents!electrons!in!the!2s!orbital!because!electrons!in!higher!energy!shells!are!further!away!from!and!less!attracted!to!the!nucleus.!!
