Unit 2: The Periodic Table and Isotopes (CFA)

• Both isotopes have the same atomic mass.

• Both isotopes have the same number of neutrons.

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DOK Level 3: Strategic Thinking

Which of the following best explains why elements in the same group of the periodic table have similar chemical properties?

• They have the same number of protons.

• They have the same number of valence electrons.

• They have the same atomic mass.

• They have the same number of neutrons.

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DOK Level 3: Strategic Thinking

• 35.5 amu

• 36.0 amu

• 35.0 amu

• 37.0 amu

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DOK Level 3: Strategic Thinking

Which of the following groups in the periodic table is known for having elements that are highly reactive nonmetals?

• Group 1: Alkali Metals

• Group 2: Alkaline Earth Metals

• Group 17: Halogens

• Group 18: Noble Gases

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DOK Level 3: Strategic Thinking

Explain why the atomic mass of an element on the periodic table is not a whole number.

• It is the average of the masses of its isotopes, weighted by their natural abundance.

• It is the sum of protons and electrons.

• It is the sum of protons and neutrons.

• It is the average of the masses of its isotopes, without considering their abundance.

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DOK Level 3: Strategic Thinking

How does the number of valence electrons affect the chemical reactivity of elements in Group 1 compared to Group 17?

• Group 1 elements are less reactive because they have more valence electrons.

• Group 17 elements are less reactive because they have fewer valence electrons.

• Group 1 elements are more reactive because they have fewer valence electrons.

• Group 17 elements are more reactive because they have more valence electrons.

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DOK Level 3: Strategic Thinking

Which of the following statements best describes the trend in atomic radius across a period in the periodic table?

• Atomic radius increases from left to right.

• Atomic radius decreases from left to right.

• Atomic radius remains constant across a period.

• Atomic radius first increases, then decreases across a period.

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DOK Level 3: Strategic Thinking

Which of the following elements is most likely to be a good conductor of electricity?

• Sulfur (S)

• Phosphorus (P)

• Copper (Cu)

• Chlorine (Cl)

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DOK Level 3: Strategic Thinking

How does the concept of isotopes explain the existence of elements with the same atomic number but different atomic masses?

• Isotopes have different numbers of protons.

• Isotopes have different numbers of electrons.

• Isotopes have different numbers of neutrons.

• Isotopes have different numbers of valence electrons.

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DOK Level 3: Strategic Thinking

Which of the following groups contains elements that are all gases at room temperature?

• Group 1: Alkali Metals

• Group 2: Alkaline Earth Metals

• Group 17: Halogens

• Group 18: Noble Gases

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DOK Level 3: Strategic Thinking