Periodic Trends - Unit 5

The atom with the largest atomic radius in Group 18 (the noble gases) is ___.

• Ar

• He

• Kr

• Rn

As you move across the periodic table from left to right, the atomic radius decreases. This is because -

• the number of protons increases, so attraction to electrons increases

• the number of energy levels increases

• the number of electrons increases

• the atomic mass increases

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NGSS.HS-PS1-2

Which atom has the largest atomic radius in Period 4 (row 4)?

• K

• Kr

• Fe

• Fe

Francium (Fr) has the lowest ionization energy in Group 1 because -

• It has the smallest number of valence electrons

• It has the greatest atomic mass

• It has the greatest number of protons, so it attracts its electrons the strongest

• Its one valence electron is very far from the nucleus, so little energy is needed to remove it

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NGSS.HS-PS1-1

The element with the smallest ionization energy in Period 6 is - 

• Rn
• Cs
• Os
• Tm

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

All groups/families have similar 

• Names

• Atomic numbers

• Atomic masses

• Properties

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NGSS.HS-PS1-1

The atom with the largest atomic radius in Period 4 (row 4) is -

• K

• Kr

• Fe

The element with the smallest ionization energy in Period 6 is - 

• Rn
• Cs
• Os
• Tm

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Arrange the following in order of increasing ionization energy: Strontium, Aluminum, Indium.

• Strontium, Indium, Aluminum

• Strontium, Aluminum, Indium

• Indium, Aluminum, Strontium

• Aluminum, Indium, Strontium

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element has greater ionization energy?

• Magnesium

• Phosphorus

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NGSS.HS-PS1-1

NGSS.HS-PS1-2