Electron shells and the periodic table
9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS1-1 · England: KS4 Combined Science: Atomic structure and the periodic table
Name
Date
Score/ 16
Question 1
How many electrons does an atom of sulfur (atomic number 16) have in its outer shell?
Answer
Question 2
Chlorine has atomic number 17. What is its electronic structure?
coral + = proton · grey = neutron · purple − = electron
- A. 2,2,13
- B. 2,8,7
- C. 17
- D. 2,15
Question 3
Who arranged the elements in an early periodic table and left gaps for undiscovered elements?
- A. Isaac Newton
- B. Dmitri Mendeleev
- C. Charles Darwin
- D. Marie Curie
Question 4
How many electrons does an atom of calcium (atomic number 20) have in its outer shell?
Answer
Question 5
Carbon has atomic number 6. What is its electronic structure?
coral + = proton · grey = neutron · purple − = electron
- A. 2,4
- B. 2,2,2
- C. 1,5
- D. 6
Question 6
Why do elements in the same group react in similar ways?
- A. They have the same number of neutrons
- B. They were discovered at the same time
- C. They have the same number of electrons in their outer shell
- D. They have the same mass
Question 7
How many electrons does an atom of helium (atomic number 2) have in its outer shell?
Answer
Question 8
Silicon has atomic number 14. What is its electronic structure?
coral + = proton · grey = neutron · purple − = electron
- A. 2,12
- B. 14
- C. 2,8,5
- D. 2,8,4
Question 9
Who arranged the elements in an early periodic table and left gaps for undiscovered elements?
- A. Isaac Newton
- B. Marie Curie
- C. Charles Darwin
- D. Dmitri Mendeleev
Question 10
How many electrons does an atom of argon (atomic number 18) have in its outer shell?
Answer
Question 11
Magnesium has atomic number 12. What is its electronic structure?
coral + = proton · grey = neutron · purple − = electron
- A. 2,8,2
- B. 2,2,8
- C. 2,10
- D. 2,8,3
Question 12
Why are noble gases so unreactive?
- A. They are liquids
- B. They are very heavy
- C. They have no electrons
- D. Their outer shell is full
Question 13
How many electrons does an atom of potassium (atomic number 19) have in its outer shell?
Answer
Question 14
Beryllium has atomic number 4. What is its electronic structure?
coral + = proton · grey = neutron · purple − = electron
- A. 1,3
- B. 4
- C. 2,2
- D. 2,2,0
Question 15
Why do elements in the same group react in similar ways?
- A. They have the same number of electrons in their outer shell
- B. They have the same number of neutrons
- C. They were discovered at the same time
- D. They have the same mass
Question 16
How many electrons does an atom of phosphorus (atomic number 15) have in its outer shell?
Answer
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