What is the approximate radius of an atom in metres?
A 3 × 10⁻¹³
B 0.003 × 10⁻⁷
C 0.3 × 10⁻⁵
D 0.03 × 10⁻¹
Your answer - OCR Gateway - GCSE Chemistry: Combined Science - Question 3 - 2019 - Paper 9
Question 3
What is the approximate radius of an atom in metres?
A 3 × 10⁻¹³
B 0.003 × 10⁻⁷
C 0.3 × 10⁻⁵
D 0.03 × 10⁻¹
Your answer
Worked Solution & Example Answer:What is the approximate radius of an atom in metres?
A 3 × 10⁻¹³
B 0.003 × 10⁻⁷
C 0.3 × 10⁻⁵
D 0.03 × 10⁻¹
Your answer - OCR Gateway - GCSE Chemistry: Combined Science - Question 3 - 2019 - Paper 9
Step 1
Identify the Options Provided
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Answer
The options for the radius of an atom in metres are:
A: 3×10−13
B: 0.003×10−7
C: 0.3×10−5
D: 0.03×10−1
Step 2
Estimate the Range of Atomic Radius
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Answer
Typically, the radius of an atom ranges from about 10−10 to 10−9 metres, with most atoms falling around 10−10 metres.
Step 3
Determine the Correct Answer
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Answer
Among the options, option B represents an atomic radius at the correct scale: 0.003×10−7=3×10−10 metres, which falls within the estimated range. Therefore, the correct answer is B.
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