Valence and trends review

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

• the number of neutrons increases

• the number of protons increases

• the number of energy levels and shielding electrons increases

• the number of atoms increases

Which of the following atoms has the largest radius?

• Ar

• He

• Kr

• Rn

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 atoms has the largest atomic radius?

• K

• Kr

• Fe

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 of the following energy has the smallest Ionization Energy?

• Rn

• Cs

• Os

• Tm

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Electronegativity is...

• the ability of an atom to attract/ accept electrons
• the ability of an atom to lose electrons
• the energy required to remove an electron from a specific atom
• how easy it is to make friends. 

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Which has the greater Electronegativity: 
N or C?

• C
• N

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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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As you move down a group on the periodic table, the number of valence electrons....

• Increases

• Decreases

• Remains the same

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