Periodic Trends & Intermolecular Forces

Which atom has the largest atomic radius?

• potassium
• rubidium 
• francium
• cesium

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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As you move across the periodic table atoms tend to get smaller because, ______________.

• the atoms have more mass.
• the atoms have less mass
• the atoms have more protons.
• the atoms have less electrons.

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Valence electrons are: 

• Electrons in the highest energy level
• Electrons closest to the nucleus
• Electrons that just come and go - they don't stay with the atom
• Electrons that are excited

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A anion will be a ____ ion.

• negative
• positive

A cation is a ____ ion.

• negative
• positive

The tendency of an atom to attract electrons

• electronegativity
• ionization energy
• electron affinity
• reactivity

As atoms of elements in group 16 are considered in order from top to bottom, the electronegativity of each successive element....

• decreases
• increases
• remains the same
• none of the above

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Put the following elements in order of decreasing ionization energy:
O, Te, Po, S.

• O, S, Po, Te
• O, S, Te, Po
• O, Te, Po, S
• O, Po, Te, S

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Which is larger:
Ca or Ca²⁺

• Ca
• Ca⁺²
• both are same size
• impossible to determine

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