Periodic Trends

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

• Ar
• He
• Kr
• Rn

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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 Period 4 (row 4) is - 

• K
• Kr
• Fe
• Fe

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

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

• Rn
• Cs
• Os
• Tm

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Of the halogens, which has the smallest radius?

• F

• Br

• He

• At

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Which of the following will have a lower ionization energy than Scandium (Sc)?

• Helium (He)

• Titanium (Ti)

• Calcium (Ca)

• Magnesium (Mg)

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Which of the following will have a higher electronegativity than arsenic (As)?

• Carbon (C)

• Neon (Ne)

• Antimony (Sb)

• Germanium (Ge)

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Which of the following halogens has the greatest electronegativity?

• Chlorine (Cl)

• Bromine (Br)

• Iodine (I)

• Astatine (At)

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Which group of elements has the lowest ionization energies?

• Alkali Metals (Group 1)

• Alkaline Earth Metals (Group 2)

• Halogens (Group 17)

• Noble Gases (Group 18)

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