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


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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