Which of the following is the correct electron configuration for a neutral oxygen atom?

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DOK Level 1: Recall

How many valence electrons does a chlorine atom have?

• 5

• 6

• 7

• 8

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DOK Level 1: Recall

• Magnesium (Mg)

• Aluminum (Al)

• Silicon (Si)

• Phosphorus (P)

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DOK Level 1: Recall

Identify the number of electron shells in a potassium (K) atom.

• 2

• 3

• 4

• 5

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DOK Level 1: Recall

Which of the following statements is true about valence electrons?

• Valence electrons are found in the innermost electron shell.

• Valence electrons determine the chemical properties of an element.

• Valence electrons are always paired.

• Valence electrons are not involved in chemical bonding.

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DOK Level 2: Skill/Concept

Explain why noble gases are generally unreactive.

• They have a full outer electron shell.

• They have no electrons.

• They have an odd number of electrons.

• They have incomplete inner shells.

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DOK Level 2: Skill/Concept

Which of the following elements has 2 valence electrons?

• Sodium (Na)

• Calcium (Ca)

• Fluorine (F)

• Nitrogen (N)

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DOK Level 1: Recall

Determine the number of valence electrons in a sulfur (S) atom and explain its significance in forming compounds.

• 4 valence electrons; it forms 4 bonds.

• 6 valence electrons; it forms 2 bonds.

• 5 valence electrons; it forms 3 bonds.

• 8 valence electrons; it forms 1 bond.

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DOK Level 2: Skill/Concept

Which of the following is the correct electron configuration for a neutral neon atom?

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DOK Level 1: Recall

What is the main purpose of the periodic table?

• To organise elements based on their atomic mass

• To organise elements based on their atomic number

• To organise elements based on their chemical properties

• To organise elements based on their physical properties

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NGSS.HS-PS1-1