Predict ion charges from the periodic table
9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS1-1, NGSS.HS-PS1-2 · England: GCSE Combined Science: Bonding, structure and the properties of matter
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Date
Score/ 16
Question 1
Why do sodium and chloride ions both end up with the electron arrangement 2,8?
- A. Sodium gains seven electrons
- B. They share electrons
- C. Sodium loses one electron and chlorine gains one, both reaching a full outer shell
- D. They both gain electrons
Question 2
An atom of chlorine (atomic number 17) forms its usual ion (charge 1−). How many electrons does the ion have?
Answer
Question 3
Magnesium (Mg) is in group 2. What charge does its ion have?
- A. 2+
- B. 1+
- C. 2−
- D. 3−
Question 4
Why does solid sodium chloride not conduct electricity, but molten sodium chloride does?
- A. In the liquid the ions are free to move and carry charge
- B. Melting creates electrons
- C. The solid has no ions
- D. Heat conducts electricity
Question 5
An atom of aluminium (atomic number 13) forms its usual ion (charge 3+). How many electrons does the ion have?
Answer
Question 6
Chlorine (Cl) is in group 17 (7). What charge does its ion have?
- A. 2−
- B. 1+
- C. 1−
- D. 3−
Question 7
What holds the ions together in sodium chloride?
- A. weak forces between molecules
- B. a sea of delocalised electrons
- C. strong electrostatic attraction between oppositely charged ions
- D. shared pairs of electrons
Question 8
An atom of nitrogen (atomic number 7) forms its usual ion (charge 3−). How many electrons does the ion have?
Answer
Question 9
Oxygen (O) is in group 16 (6). What charge does its ion have?
- A. 2+
- B. 2−
- C. 3+
- D. 1+
Question 10
Why does magnesium oxide have a much higher melting point than sodium chloride?
- A. Oxygen is a gas
- B. Magnesium oxide is covalent
- C. Mg²⁺ and O²⁻ have larger charges, so the ionic bonds are stronger
- D. Sodium chloride has no bonds
Question 11
An atom of chlorine (atomic number 17) forms its usual ion (charge 1−). How many electrons does the ion have?
Answer
Question 12
Oxygen (O) is in group 16 (6). What charge does its ion have?
- A. 3+
- B. 3−
- C. 2−
- D. 1+
Question 13
Why do sodium and chloride ions both end up with the electron arrangement 2,8?
- A. Sodium gains seven electrons
- B. Sodium loses one electron and chlorine gains one, both reaching a full outer shell
- C. They share electrons
- D. They both gain electrons
Question 14
An atom of potassium (atomic number 19) forms its usual ion (charge 1+). How many electrons does the ion have?
Answer
Question 15
Chlorine (Cl) is in group 17 (7). What charge does its ion have?
- A. 1+
- B. 2+
- C. 1−
- D. 3+
Question 16
Why do sodium and chloride ions both end up with the electron arrangement 2,8?
- A. They share electrons
- B. They both gain electrons
- C. Sodium gains seven electrons
- D. Sodium loses one electron and chlorine gains one, both reaching a full outer shell
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