Periodic Trends Atomic Radii

Which atom has the largest atomic radius?

• potassium
• rubidium 
• francium
• cesium

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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

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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Which of the following pairs of elements have similar properties

• Barium and Calcium
• Sodium and Magnesium
• Nickel and Copper
• Lithium and Helium 

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Order the following in increasing atomic radii: 
Ra, Be, Ca, Rb, H

• Ra, Be, Rb, H, Ca
• Rb, H, Ca, Be, Ra
• Ra, Rb, Ca, Be, H
• H, Be, Ca, Rb, Ra

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Which one has the largest radius?

• Lithium (Li, atomic #3)
• Boron (B, atomic #5)
• Neon (Ne, atomic #10)
• Nitrogen (N, atomic #7)

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Which scientist developed the first published periodic table where elements were placed in order of increasing atomic mass?

• Henry Moseley

• Johann Dobereiner

• John Dalton

• Dmitri Mendeleev

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Which periodic trend has to do with the width of a given atom?

• Ionic Radius

• Atomic Radius

• Electronegativity

• Reactivity

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As you move up group 16, reactivity of successive elements _______.

• Decreases

• Increases

• Stays the same

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Elements in the same group have similar _______.

• Atomic Mass

• Symbol

• Chemical Properties

• Atomic Number

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