Everyday Science MCQs (page 21 of 51)
Physics, chemistry, biology, the human body, units and the solar system, covering the everyday science section of general-ability tests.
1,014 questions. Select an option to check your answer, or open "Show answer". Showing 401–420.
- 401.
Which element has the atomic number 85?
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Answer: B. Astatine
Atomic number 85 belongs to astatine (At).
- 402.
What is the chemical symbol of radon?
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Answer: B. Rn
The symbol of radon is Rn.
- 403.
Which element has the chemical symbol Rn?
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Answer: B. Radon
Rn is the symbol of radon.
- 404.
What is the atomic number of radon?
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Answer: C. 86
Radon has 86 protons, so its atomic number is 86.
- 405.
Which element has the atomic number 86?
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Answer: D. Radon
Atomic number 86 belongs to radon (Rn).
- 406.
What is the chemical symbol of francium?
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Answer: D. Fr
The symbol of francium is Fr.
- 407.
Which element has the chemical symbol Fr?
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Answer: C. Francium
Fr is the symbol of francium.
- 408.
What is the atomic number of francium?
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Answer: B. 87
Francium has 87 protons, so its atomic number is 87.
- 409.
Which element has the atomic number 87?
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Answer: A. Francium
Atomic number 87 belongs to francium (Fr).
- 410.
What is the chemical symbol of radium?
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Answer: D. Ra
The symbol of radium is Ra.
- 411.
Which element has the chemical symbol Ra?
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Answer: B. Radium
Ra is the symbol of radium.
- 412.
What is the atomic number of radium?
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Answer: C. 88
Radium has 88 protons, so its atomic number is 88.
- 413.
Which element has the atomic number 88?
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Answer: D. Radium
Atomic number 88 belongs to radium (Ra).
- 414.
What is the chemical symbol of actinium?
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Answer: A. Ac
The symbol of actinium is Ac.
- 415.
Which element has the chemical symbol Ac?
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Answer: A. Actinium
Ac is the symbol of actinium.
- 416.
What is the atomic number of actinium?
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Answer: A. 89
Actinium has 89 protons, so its atomic number is 89.
- 417.
Which element has the atomic number 89?
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Answer: B. Actinium
Atomic number 89 belongs to actinium (Ac).
- 418.
What is the chemical symbol of thorium?
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Answer: C. Th
The symbol of thorium is Th.
- 419.
Which element has the chemical symbol Th?
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Answer: B. Thorium
Th is the symbol of thorium.
- 420.
What is the atomic number of thorium?
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Answer: C. 90
Thorium has 90 protons, so its atomic number is 90.