Atomic Theory and Periodic Trends Review

As you move down a group, atomic radius increases because - 

• you add more and more neutrons
• you add more and more protons
• you add more and more shells (energy levels)
• you add more atomic mass

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

• Ar
• He
• Kr
• Rn

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

• K
• Kr
• Fe
• Fe

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What is the name of this group?

• alkali metals

• alkaline earth metals

• transition metals

• halogens

• noble gases

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What is the name of this group?

• alkali metals

• alkaline earth metals

• transition metals

• halogens

• noble gases

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How many valence electrons does this group have?

• 1

• 2

• 7

• 8

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What charge do ions of this group have?

• +1

• +2

• -2

• -1

• 0

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Which element has an atomic radius that is LARGER than sodium?

• Lithium (Li)

• Hydrogen (H)

• Magnesium (Mg)

• Potassium (K)

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Which element has an atomic radius that is SMALLER than boron?

• beryllium (Be)

• aluminum (Al)

• carbon (C)

• Gallium (Ga)

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