Atomic Radius Trend

Which of the following atoms would have the largest radius?

• chlorine

• silicon

• sodium

• argon

Why does radius decrease as you move across a period?

• because electrons are being added

• because protons are being added

• because energy levels are being lost

• because energy levels are being added

Which element has the largest atomic radius?

• barium

• magnesium

• carbon

• helium

Why does radius increase as you move down a period?

• protons are being added

• ionization energy is increasing

• protons are getting weaker

• energy levels are being added

Within periods on the periodic table: Size decreases as you go down a group

• Flase

• True

As you move ______ a group, more energy levels are added, which increases the size of the atom

• down

• up

• diagonal

• away

Which element's atom is larger? Nitrogen or Phosphorus?

• Nitrogen

• Phosphorus

Which element's atom is the smallest?

• Rhodium

• Silver

• Cadmium

• Tin

Which of these best explains the reasoning behind the trend that as you go across a period, size decreases?

• As you go across a period, more energy levels are added, which shrinks the atom.

• The added electrons in the nucleus give the atom a negative charge, which shrinks the atom.

• The added protons in the nucleus pull the electrons closer to them, which shrinks the atom.

• All of the above

Which order is correct from largest to smallest atomic radius?

• Thallium, Indium, Gallium, Boron

• Boron, Thallium, Indium, Gallium

• Boron, Gallium, Indium, Thallium

• Thallium, Gallium, Indium, Boron