Periodic Trends CA Study Guide

Which statement best describes Group 2 elements as they are considered in order from top to bottom of the Periodic Table?

• The number of principal energy levels increases, and the number of valence electrons increases.

• The number of principal energy levels increases, and the number of valence electrons remains the same.

• The number of principal energy levels remains the same, and the number of valence electrons increases.

• The number of principal energy levels remains the same, and the number of valence electrons decreases.

What is the total number of valence electrons in an atom of boron in the ground state?

• 1

• 7

• 3

• 5

What is the total number of valence electrons in an atom of xenon, Xe?

• 0

• 2

• 8

• 18

The elements calcium and strontium have similar chemical properties because they both have the same

• atomic number

• mass number

• number of valence electrons

• number of completely filled sublevels

On the Periodic Table, elements within Group 16 have the same number of

• valence electrons

• energy levels

• protons

• neutrons

An element with a partially filled d sublevel in the ground state is classified as

• a halogen

• a transition metal

• an alkali metal

• an alkaline earth metal

Which electron configuration represents a transition element?

• 1s² 2s² 2p⁵

• [Ar]3d² 4s²

• [Ar]3d¹⁰ 4s² 4p⁶

Which of the following atoms has the largest atomic radius?

• Na

• K

• Mg

• Ca

Which element in Period 5 of the Periodic Table is a transition element?

• Sr

• Sb

• Ag

• Xe

Which noble gas has the highest first ionization energy?

• radon

• krypton

• neon

• helium