Which element has the highest ionization energy?

• Argon

• Helium

• Potassium

• Magnesium

Which trend is observed for ionization energy across a period?

• Decreases

• Increases

• Remains constant

• Increases and then decreases

Which of the following elements has the lowest ionization energy?

• Francium

• Sodium

• Lithium

• Potassium

Order the following elements by increasing atomic size: Si, P, Xe, Ar, He.

• He < Ar < Xe < P < Si

• Si < P < Xe < Ar < He

Which of the following is the correct order of atomic size?

• He < P < Xe < Ar < Si

• He < Xe < P < Ar < Si

• Xe < He < P < Ar < Si

What is the periodic trend for electronegativity down a group?

• Increases

• Decreases

• Remains constant

• Increases and then decreases

Which of the following molecules is polar?

• CH4

• CO2

• H2O

• N2

Which bond type occurs when electrons are shared equally?

• Ionic

• Polar covalent

• Nonpolar covalent

• Metallic

Which molecule is nonpolar due to its symmetry?

• HF

• HCl

• CH4

• H2O

In HF, which atom attracts electrons more strongly?