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.

Q1:

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

  • Anuclear binding energy
  • Belectron affinity
  • Cboiling point
  • Dionization energy
  • Eenthalpy of combustion

Q2:

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 smaller metal atoms have a greater attraction to the lone pairs of the oxygen atom in water.
  • BThe electronegativity increases with additional electron shells.
  • 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.

Q3:

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

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

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