Atomic Radius & Reactivity Trends

What is formally known as the distance from the nucleus of an atom and to the valence shell?

• Atomic radius

• Electron Affinity

• Ionization Energy

• Electronegativity

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NGSS.HS-PS1-1

What are the shielding electrons?

• Electrons in the highest energy level furthest from the nucleus.

• Electrons in the energy levels between the nucleus and the valence shell.

• Electrons that are lost and gained by an atom to get a full octet.

• Electrons that have absorbed a photon and moved from a lower to a higher energy level.

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What are valence electrons?

• Electrons in the outermost energy level.

• Electrons closest to the nucleus.

• Electrons that identify the atom as that of a particular element.

• Electrons that release photons and move from a higher to lower energy level.

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How does nuclear shielding (or shielding electrons) in the same family affect effective nuclear charge (nuclear pull)?

• increases effective nuclear charge

• decreases effective nuclear charge

• it does not affect the effective nuclear charge

In moving from left to right across a period on the Periodic Table, what happens to the the effective nuclear charge (nuclear pull)?

• strengthens

• weakens

• stays the same

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NGSS.HS-PS1-1

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Which of the following atoms has the largest atomic radius?

• potassium (K)

• rubidium (Rb)

• francium (Fr)

• cesium (Cs)

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NGSS.HS-PS1-1

Which atom in the list below has the largest atomic radius?

• Argon (Ar)

• Helium (He)

• Krypton (Kr)

• Radon (Rn)

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Which group/family has the smallest atomic radius on the Periodic Table?

• Alkali Metals

• Halogens

• Noble Gases

• Transition Metals

• Actinide Series

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What term essentially means "the size of the atom"?

• chemical reactivity

• atomic radius

• nuclear shielding

• effective nuclear charge

Which of the following is a TRUE statement?

• As you go down a group/family, the size of atoms increase because of decreased nuclear shielding and strengthened effective nuclear charge.

• As you go down a group/family, the size of atoms increase because of increased nuclear shielding and weakened effective nuclear charge.

• As you go down a group/family, the size of atoms decrease because of decreased nuclear shielding and strengthened effective nuclear charge.

• As you go down a group/family, the size of atoms decrease because of increased nuclear shielding and weakened effective nuclear charge.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2