Unit 2, 3, & 4 Review for Chemistry

Choose the electron configurations which are possible for an unexcited atom.

• 1s² 2s² 2p⁴

• 1s² 2s² 2p⁶ 3s² 3p³ 3d¹

• 1s²2s²2p⁸3s¹

• 1s²2s²2p⁶3s¹

What is the correct electron configuration fro Arsenic?

• 1s²2s²2p⁶3s²3d⁶4s²3p¹⁰4d³

• 1s²2s²2p⁶3s²3p⁶4s²3d⁶4p⁶

• 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p³

• 1s²2s²2p⁶2d¹⁰3s²3p⁶3d⁵

• A

• B

• C

• D

• F

• G

• H

• J

Why are metals able to conduct heat and electricity well?

• the ability of the electrons to move freely throughout the metal

• the energy which is inherent in the molecular mass of the metal

• the attraction of the electrons to the energy of kinesis

Which of the following describes metallic bonding?

• A bond between atoms where electron pairs are unequally shared

• a bond between positive ions and negative ions

• a bond between positive ions and surrounding mobile electrons

• a bond between atoms where electron pairs are shared equally

What is the best explanation for the organization of Mendeleev's periodic table by atomic mass rather than atomic number?

• atomic mass is unrelated to the chemical reactivity of the element.

• Mendeleev organized the table prior to the discovery of atomic number.

• different isotopes of elements have different atomic masses

• atomic numbers are not affected by the chemical reactivity of elements

As the atomic number increases across the periodic table, what happens to the number of electrons?

• they are unchanged

• They increase

• they decrease

• they alternate

Which group of elements is generally unreactive?

• alkali metals

• alkaline earth metals

• halogens

• noble gases

Elements in which group would have the largest atomic radii?

• group 1

• group 2

• group 15

• group 18