Atomic Radius

What is the definition of Atomic Radius?

• Atomic radius is the distance from the brim of the nucleus to the outermost shell containing electrons.

• Atomic radius is the distance from the center of the nucleus to the innermost shell containing electrons.

• Atomic radius is the distance from the center of the nucleus to the outermost shell containing electrons.

• Atomic radius is the distance from the center of the nucleus to the outermost shell containing protons.

Which periodic group has the smallest atomic radius?

• Halogens

• Alkali metals

• Transition metals

• Noble Gases

Does the atomic size increase or decrease when going across the period?

• Increases

• Decreases

As you move down the periodic table atoms get bigger. This is because ____________.

• The atoms have more mass.

• The atoms have more protons.

• The atoms have more neutrons

• The atoms have more energy levels

The more protons there are, the ________ .

• Smaller the electrons

• Weaker the pull

• Bigger the electrons

• Stronger the pull

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

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Which atom has the largest atomic radius?

• potassium

• rubidium

• francium

• cesium

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As you move across the periodic table atoms tend to get smaller because, ______________.

• the atoms have more mass.

• the atoms have less mass

• the atoms have more protons.

• the atoms have less electrons.

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The atom with the largest atomic radius in Group 18 is - 

• Ar

• He

• Kr

• Rn

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