Chemistry: Periodic Trends

Which of the following elements has the smallest radius?

• Mg
• Al
• Si
• K

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Which element in Period 2 has the greatest atomic radius?

• Be

• C

• Na

• Li

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Of the halogens (group 7A), which has the smallest radius?

• F

• Br

• He

• At

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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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Ionization energy is...

• the energy required to add an electron to a specific atom
• how much energy it takes to remove an electron from an atom
• the energy required to shield the outer electrons from the nucleus
• a measure of the ability of an atom to attract electrons

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Electronegativity __________ from left to right within a period and __________ from top to bottom within a group.

• decreases, increases

• increases, increases

• increases, decreases

• stays the same, increases

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The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers

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The atom with the largest atomic radius in Group 8A is -

• Ar

• He

• Kr

• Rn

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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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Which has the greater EN: 
H or F?

• H
• F

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