3 (a) (i) Use words from the box to complete the sentences below about ions - Edexcel - GCSE Physics Combined Science - Question 3 - 2019 - Paper 1
Question 3
3 (a) (i) Use words from the box to complete the sentences below about ions.
Atoms may form positive ions by __________________________ electrons.
The electrons inv... show full transcript
Worked Solution & Example Answer:3 (a) (i) Use words from the box to complete the sentences below about ions - Edexcel - GCSE Physics Combined Science - Question 3 - 2019 - Paper 1
Step 1
(i) Use words from the box to complete the sentences below about ions.
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Answer
Atoms may form positive ions by losing electrons.
The electrons involved in forming positive ions are the outer electrons.
Step 2
(ii) Which of these radiations is both electromagnetic and ionising?
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Answer
The correct answer is C gamma.
Step 3
(iii) Which type of radiation will travel the shortest distance in air?
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Answer
The correct answer is A alpha.
Step 4
(i) State one way in which radioactive isotopes can be harmful to people.
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Answer
Radioactive isotopes can cause cancer due to radiation exposure.
Step 5
(ii) Lead-214 emits β- particles. Describe what happens to the nucleus of a lead-214 atom when it emits a β- particle.
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Answer
When lead-214 emits a β- particle, a neutron in the nucleus is converted into a proton, resulting in an increase in the atomic number by 1 and the formation of a different element, bismuth-214.
Step 6
(c) The typical size of an atom is
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Answer
The correct answer is B 10^-10 m.
Step 7
(d) Calculate how many times the mass of a proton is greater than the mass of an electron.
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Answer
To find how many times the mass of a proton is greater than that of an electron, divide the mass of the proton by the mass of the electron:
\approx 1836.15$$
Thus, the mass of a proton is approximately **1840** times greater than the mass of an electron.
