Atomic number, mass number and isotopes
8th grade (Year 9 in England) · 16 questions · Common Core: NGSS.HS-PS1-1 · England: KS4 Combined Science: Atomic structure and the periodic table
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Score/ 16
Question 1
Carbon has atomic number 6. How many neutrons are in the isotope carbon-12?
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Question 2
What are isotopes?
- A. atoms of different elements with the same mass
- B. atoms with different numbers of protons
- C. atoms of the same element with different numbers of neutrons
- D. charged atoms
Question 3
An atom of aluminium (aluminum) is written ²⁷₁₃Al (mass number 27, atomic number 13). How many electrons does it have?
Answer
Question 4
Hydrogen has atomic number 1. How many neutrons are in the isotope hydrogen-3?
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Question 5
Which number is the same for all isotopes of an element?
- A. the number of neutrons
- B. the atomic number
- C. the mass number
- D. the relative mass
Question 6
An atom of potassium is written ³⁹₁₉K (mass number 39, atomic number 19). How many protons does it have?
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Question 7
Uranium has atomic number 92. How many neutrons are in the isotope uranium-238?
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Question 8
What are isotopes?
- A. atoms with different numbers of protons
- B. charged atoms
- C. atoms of different elements with the same mass
- D. atoms of the same element with different numbers of neutrons
Question 9
An atom of hydrogen is written ¹₁H (mass number 1, atomic number 1). How many electrons does it have?
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Question 10
Hydrogen has atomic number 1. How many neutrons are in the isotope hydrogen-3?
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Question 11
Which number is the same for all isotopes of an element?
- A. the relative mass
- B. the number of neutrons
- C. the atomic number
- D. the mass number
Question 12
An atom of sulfur is written ³²₁₆S (mass number 32, atomic number 16). How many electrons does it have?
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Question 13
Uranium has atomic number 92. How many neutrons are in the isotope uranium-235?
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Question 14
A sodium atom loses one electron to become a sodium ion. What is its charge?
- A. +11
- B. 0
- C. −1
- D. +1
Question 15
An atom of fluorine is written ¹⁹₉F (mass number 19, atomic number 9). How many protons does it have?
Answer
Question 16
Carbon has atomic number 6. How many neutrons are in the isotope carbon-14?
Answer
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