Unit 2 Exam Review

Which of the following statements about this graph of successive ionization energies of a single atom is TRUE?

• The atom is in group 13.

• The atom has 3 valence electrons.

• The atom will ionize to form an anion.

• The atom has 10 core electrons.

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NGSS.HS-PS1-1

Which of the following ions is isoelectronic to Neon (Ne)?

• Mg2+

• Be2+

• O2-

• Cl-

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NGSS.HS-PS1-1

Which of the following statements is true about elements with high electronegativity?

• They are more likely to gain electrons during chemical reactions.

• They tend to form cations easily.

• They have a smaller effective nuclear charge.

• They experience a weaker attraction between the nucleus and valence electrons.

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Select the piece of evidence that best supports the statement: When comparing two atoms, the ionization energy decreases when the shielding effect increases.

• Comparison of the ionization energy data points for As and Br

• Comparison of the ionization energy data points for Ar and K

• Comparison of the ionization energy data points for B and C

• Comparison of the ionization energy data points for Li and Na

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Which is the best explanation for why this occurs?

• Effective nuclear charge increases as you move from left to right across a period

• Electron shielding remains constant as you move from left to right across a period

• Electron shielding stays the same as you move from top to bottom down a group

• Effective nuclear charge and electron shielding are not involved in why the ionization energy changes

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When copper becomes a cation, it will lose electrons from which subshell?

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁹

• 3s

• 3p

• 4s

• 3d

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Which group number does the atom in the diagram belong to?

• A. 2

• B. 6

• C. 16

• D. 18

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Which of the following has the same number of valence electrons as the atom in the diagram?

• Neon (Ne)

• Phosphorus (P)

• Iodine (I)

• Selenium (Se)

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What charge will this Nitrogen have when it ionizes to its most stable ionic form? (HINT: How many VALENCE electrons does it need to be "stable"?)

• 3–

• 5–

• 0 because it already has a full octet and will not ionize.

• 3+

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What causes the shielding effect to remain constant as additional valence electrons are added across a period?

• The atomic radius increases as valence electrons are added

• The charge on the nucleus is constant across a period

• The valence electrons are added to different energy levels of the period

• The number of core electrons does not change as electrons are added to valence subshells of the period.

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