Periodic Trends

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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NGSS.HS-PS1-1

Which atom has the largest atomic radius?

• potassium
• rubidium 
• francium
• cesium

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NGSS.HS-PS1-1

The element with the largest electronegativity in the halogens is - 

• At
• F
• Cl
• Br

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NGSS.HS-PS1-1

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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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NGSS.HS-PS1-1

NGSS.HS-PS1-2

The energy required to remove electrons is the definition of: 

• Electronegativity
• Atomic Number
• Atomic Radius
• Ionization

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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NGSS.HS-PS1-1

NGSS.HS-PS1-2

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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NGSS.HS-PS1-1

NGSS.HS-PS1-2

What elements have zero electronegativity?

• metals
• nonmetals
• metalloids
• noble gases

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NGSS.HS-PS1-1

Put these in order of increasing electronegativity:
Se, S, and O

• Se < S < O
• Se < O < S
• O < S < Se
• S < Se < O

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NGSS.HS-PS1-1

NGSS.HS-PS1-2