Periodic Trends Atomic Radius

The atomic radius across period

• decrease from left to right

• Increase from left to right

• decrease from right to left

• stay the same

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Which periodic group has the smallest atomic radius?

• Alkali metals

• Halogens

• Noble Gases

• Transition metals

Which statement correctly and completely identifies a trend?

• Atomic radius decreases across a period and increases down a group.

• Electronegativity decreases across a period and decreases down a group.

• Ionization energy increases across a period and increases down a group.

• Ionic radius increases across a period and increases down a group.

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NGSS.HS-PS1-1

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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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The distance from nucleus to valence shell is called...

• Electronegativity

• Ionization energy

• Atomic radius

• Metallic character

Predict the element with the largest atomic radius in the second period.

• Lithium (Li)

• Beryllium (Be)

• Boron (B)

• Neon (Ne)

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NGSS.HS-PS1-1

Predict the element with the smallest atomic radius in the third period.

• Sodium (Na)

• Magnesium (Mg)

• Aluminum (Al)

• Chlorine (Cl)

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Indicate whether the following properties increases or decreases from left to right across the periodic table.

Atomic Radius(excluding noble gases)

• Increases

• Decreases

As you move across a period from left to right in the periodic table, what happens to the atomic radius?

• It increases

• It decreases

• It remains the same

• It fluctuates

Analyze the factors that contribute to the increase in atomic radius as you move down a group.

• Increased nuclear charge and decreased shielding

• Increased number of electron shells and increased shielding

• Decreased nuclear charge and increased electron affinity

• Decreased number of electron shells and decreased shielding

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NGSS.HS-PS1-1

NGSS.HS-PS1-2