9th grade atoms, elements and the periodic table
9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS1-1, NGSS.HS-PS1-2 · England: KS4 Combined Science: Atomic structure and the periodic table, GCSE Combined Science: Bonding, structure and the properties of matter
Name
Date
Score/ 16
Question 1
What is the formula of ammonium chloride? (Ions: NH₄⁺ and Cl⁻)
- A. (NH₄)₂Cl
- B. NH₄Cl₂
- C. NH₄Cl
Question 2
Oxygen (O) is in group 16 (6). What charge does its ion have?
- A. 1−
- B. 2−
- C. 1+
- D. 3+
Question 3
An atom of fluorine (atomic number 9) forms its usual ion (charge 1−). How many electrons does the ion have?
Answer
Question 4
Beryllium has atomic number 4. What is its electronic structure?
coral + = proton · grey = neutron · purple − = electron
- A. 2,2
- B. 2,3
- C. 2,2,0
- D. 1,3
Question 5
Which compound contains an ion made of more than one atom?
- A. potassium chloride
- B. sodium bromide
- C. magnesium oxide
- D. potassium nitrate
Question 6
Why do sodium and chloride ions both end up with the electron arrangement 2,8?
- A. They share electrons
- B. Sodium gains seven electrons
- C. They both gain electrons
- D. Sodium loses one electron and chlorine gains one, both reaching a full outer shell
Question 7
In NaBr (sodium bromide), how many sodium ions are there for each formula unit?
Answer
Question 8
Why does potassium react more vigorously with water than sodium?
- A. It has a full outer shell
- B. It has fewer protons
- C. It is a non-metal
- D. Its outer electron is further from the nucleus, so it is lost more easily
Question 9
How many electrons does an atom of phosphorus (atomic number 15) have in its outer shell?
Answer
Question 10
What is the formula of aluminium sulfide? (Ions: Al³⁺ and S²⁻)
- A. Al₃S₂
- B. Al₃S₃
- C. Al₂S₄
- D. Al₂S₃
Question 11
Calcium (Ca) is in group 2. What charge does its ion have?
- A. 1−
- B. 1+
- C. 3+
- D. 2+
Question 12
An atom of chlorine (atomic number 17) forms its usual ion (charge 1−). How many electrons does the ion have?
Answer
Question 13
Fluorine has atomic number 9. What is its electronic structure?
coral + = proton · grey = neutron · purple − = electron
- A. 2,2,5
- B. 2,8
- C. 2,7
- D. 9
Question 14
An ionic compound has the formula X₂O₃. What is the charge on the X ion?
- A. 2+
- B. 3+
- C. 6+
- D. 1+
Question 15
Why does solid sodium chloride not conduct electricity, but molten sodium chloride does?
- A. Melting creates electrons
- B. The solid has no ions
- C. In the liquid the ions are free to move and carry charge
- D. Heat conducts electricity
Question 16
In (NH₄)₂CO₃ (ammonium carbonate), how many ammonium ions are there for each formula unit?
Answer
All done? Color in the animal! · Free from eurekami.com/math