Worksheet: Reactivity Trends in the Periodic Table

In this worksheet, we will practice describing and explaining trends in reactivity across periods and down groups in the periodic table.


Complete the sentence: It is safer to inflate balloons with helium than hydrogen because helium displays a higher .

  • Aelectron affinity
  • Bionization energy
  • Centhalpy of combustion
  • Dnuclear binding energy
  • Eboiling point


Group II metals show differing reactivity with water, depending on their position within the Periodic Table. Explain the trend in reactivity between beryllium and barium.

  • AThe electronegativity increases with additional electron shells.
  • BThe smaller metal atoms have a greater attraction to the lone pairs of the oxygen atom in water.
  • CThe presence of d-orbital electrons in the larger metal atoms allows for decreased water reactivity.
  • DThe electrons of the larger metal atoms are farther from the nucleus and easier to remove.


In what unique way is nitrogen similar to carbon and oxygen (adjacent 2nd row elements)?

  • AThe outer shell s- and p-orbitals of nitrogen can be hybridized to form four sp3 orbitals that form a tetrahedron.
  • BIt can form three bonds to other atoms in a neutral molecule.
  • CIt has a pair of electrons in a nonbonding sp3 orbital.
  • DAll three have two electrons in the 1s orbital.


Which group 13 element has the highest melting point?

  • AGallium
  • BBoron
  • CAluminum
  • DTantalum
  • EIndium

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