The diagram shows how a property of Period 3 elements varies across the period.

What is the property?

• Atomic radius

• Electronegativity

• First ionisation energy

• Melting point

Tags

NGSS.HS-PS1-1

Which element has the highest first ionisation energy?

• Aluminium

• Phosphorus

• Silicon

• Sulfur

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of these Period 3 elements has the highest melting point?

• Aluminium

• Phosphorus

• Sodium

• Sulfur

Tags

NGSS.HS-PS1-1

Which is the correct order of melting points of these Period 3 elements?

• phosphorus > sulfur > chlorine > argon

• argon > chlorine > phosphorus > sulfur

• sulfur > phosphorus > chlorine > argon

• chlorine > phosphorus > sulfur > argon

Tags

NGSS.HS-PS1-1

Which of the following is a correct statement about the trend in atomic radius across Period 3 of the Periodic Table?

• radius increases because the atoms have more electrons

• radius decreases because nuclear charge increases

• radius increases because shielding (screening) increases

• radius decreases because shielding (screening) decreases

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which elements are shown in increasing order of the stated property?

• Atomic radius: phosphorus, sulfur, chlorine.

• First ionisation energy: sodium, magnesium, aluminium.

• Electronegativity: sulfur, phosphorus, silicon.

• Melting point: argon, chlorine, sulfur.

Tags

NGSS.HS-PS1-1

Which of these elements has the highest second ionisation energy?

• Na

• Mg

• Ne

• Ar

Tags

NGSS.HS-PS1-1

Which one of the following statements is correct?

• The first ionisation energies of the elements in Period 3 show a general decrease from sodium to chlorine.

• The electronegativities of Group 2 elements decrease from magnesium to barium.

• The strength of the intermolecular forces increases from hydrogen fluoride to hydrogen chloride.

• The ability of a halide ion to act as a reducing agent decreases from fluoride to iodide.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2