Unit 6 & 7 Review

Electron configurations can be represented in an abbreviated form also known as the Noble Gas Configuration for an element. What is the correct name and Noble Gas Configuration for the element with the following configuration?

• Zirconium – [Kr]5s²4d²

• Zirconium – [Xe]5s²4d²

• Strontium – [Kr] 5s²4d²

• Strontium – [Ar] 5s²4d²

The Lewis valence dot electron structures are used to illustrate the number of valence electrons of atoms of representative elements. Considering this, use the Periodic Table to predict the number of “dots” that should be drawn around Antimony (Sb) to represent its Lewis Dot Structure.

• 2

• 5

• 6

• 8

What is the identity of the element with the electron configuration of 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰?

• Ca

• Cd

• Zn

• P

Which element has the same s and p configuration for the 4th principal energy level as the element CI has for its 3rd principal energy level?

• F

• I

• Br

• Kr

Carbon has the potential of bonding with another carbon atom more than once forming more than one covalent bond. What is an example of a carbon molecule containing a triple bond?

• CH₂

• CH₄

• CO

• CO₂

Using the characteristics of the electron configuration of elements, which elements are described below in order from A to D?

• Mn, Sr, V, Br

• Br, Li, Al, Sc

• Br, P, Sr, Sc

• N, Li, He, H

Identify the group of elements with the same outermost energy level.

• H, He

• N, P, As, Bi

• Rb, Sr, Y, Zr

• B, Si, As, Te, At

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

Example 1 – 1s²2s²2p⁴

Example 2 – 1s²2s²2p⁶3s²3p³3d¹

Example 3 – 1s²2s²2p⁸3s¹

Example 4 – 1s²2s²2p⁶3s¹

• 1, 3, & 4

• 1 & 4

• 2 & 3

• 2 only

What is the electron configuration for an atom of polonium at ground state?

• [Xe]6s²5d¹⁰6p⁴

• [Xe]6s²4f¹⁴5d¹⁰6p⁴

• [Xe]6s²6f¹⁴6d¹⁰6p⁴

• [Xe]6s²6d¹⁰6p⁴

Which of the following is a correct electron configuration?

• 1s² 2s² 2p⁶ 3s² 3d⁶ 4s² 3p¹⁰ 4d³

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶ 4p⁶

• 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p³

• 1s² 2s² 2p⁶ 2d¹⁰ 3s² 3p⁶ 3d⁵