Atomic structure and isotopes Quiz
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5 questions, one answer each
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1. How many protons, neutrons and electrons are there in ⁵⁶Fe³⁺ (atomic number 26)?
- A. 26 protons, 56 neutrons, 23 electrons
- B. 26 protons, 30 neutrons, 23 electrons
- C. 26 protons, 30 neutrons, 29 electrons
- D. 23 protons, 33 neutrons, 26 electrons
2. Which pair of species are isotopes of the same element?
- A. ¹⁴₆C and ¹⁴₇N
- B. ²³₁₁Na and ²³₁₁Na⁺
- C. ¹⁶₈O and ¹⁸₉F
- D. ¹²₆C and ¹⁴₆C
3. What is the relative mass of an electron?
- A. 1
- B. 0
- C. 1/1836
- D. 1836
4. Why do ³⁵Cl and ³⁷Cl have the same chemical properties?
- A. They have the same mass number
- B. They have the same number of neutrons
- C. They have the same number of electrons
- D. They have the same relative atomic mass
5. How many neutrons are there in an ⁸¹Br⁻ ion (atomic number 35)?
- A. 46
- B. 36
- C. 35
- D. 81