Effective Nuclear Charge

How does the effective nuclear charge relate to atomic radius?

• An increase in effective nuclear charge decreases the atomic radius

• An increase in effective nuclear charge increases the atomic radius

• The effective nuclear charge has no effect on the atomic radius

• The effective nuclear charge only affects isotopes

What trend in atomic radius occurs as you move from left to right across a period in the periodic table?

• The atomic radius increases because the nuclear charge decreases

• The atomic radius decreases because the nuclear charge increases

• The atomic radius remains constant because the number of energy levels remains the same

• The atomic radius increases because the number of neutrons increases

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NGSS.HS-PS1-1

Why does Fluorine (F) have a smaller atomic radius than Lithium (Li)?

• Because Fluorine has fewer protons than Lithium

• Because Fluorine has more energy levels than Lithium

• Because Fluorine has a higher nuclear charge, pulling electrons closer

• Because Lithium is a gas at room temperature

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NGSS.HS-PS1-1

Effective nuclear charge measures the attraction a valence electron feels to the nucleus of an atom. It is calculated by subtracting the​ (a)   from the​ (b)  

• number of core electrons

• total number of protons

• number of valence electrons

• total number of neutrons

Match the effective nuclear charge to the correct atom

• +7

• P

• +8

• Mg

• +2

• Ar

• +3

• Cl

• +5

• Al

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NGSS.HS-PS1-1

Considering the metals: Na, Mg, and Al we note that ​ (a)   has the highest effective nuclear charge. During an experiment we note that Al is the least reactive of the three metals. We would predict​ (b)   to be the most reactive.

• Al

• Na

• Mg

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Ionization energy increases moving from left to right accross the periodic table because

• effective nuclear charge increases

• the valence electrons are further from the nucleus

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

The two atoms with the same effective nuclear charge as Mg are​ ​

• Ca

• Be

• Na

• Al

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NGSS.HS-PS1-1

What is the effective nuclear charge experienced by a valence electron in a chlorine atom?

• A) +7

• B) +17

• C) +10

• D) +1

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NGSS.HS-PS1-1

Which of the following elements has the highest effective nuclear charge for its valence electrons?

• A) Sodium (Na)

• B) Magnesium (Mg)

• C) Aluminum (Al)

• D) Silicon (Si)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2