Use words from the box to complete the sentences below about ions - Edexcel - GCSE Physics Combined Science - Question 3 - 2019 - Paper 1
Question 3
Use words from the box to complete the sentences below about ions.
Atoms may form positive ions by _____________________ electrons.
The electrons involved in formin... show full transcript
Worked Solution & Example Answer: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) Atoms may form positive ions by _____________________ electrons.
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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 type of radiation that is both electromagnetic and ionising is C gamma.
Step 3
iii) Which type of radiation will travel the shortest distance in air?
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Answer
The type of radiation that will travel the shortest distance in air is A alpha.
Step 4
b (i) State one way in which radioactive isotopes can be harmful to people.
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Answer
Radioactive isotopes can be harmful to people by causing radiation sickness or increasing the risk of cancer.
Step 5
b (ii) Describe what happens to the nucleus of a lead-214 atom when it emits a β- particle.
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When a lead-214 atom emits a β- particle, a neutron in the nucleus is converted into a proton, resulting in the formation of bismuth-214 while increasing the atomic number by 1.
Step 6
c) The typical size of an atom is
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The typical size of an atom 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 calculate how many times the mass of a proton is greater than the mass of an electron:
ext{Mass of proton} = 1.6726 imes 10^{-27} ext{ kg}
ext{Mass of electron} = 9.1094 imes 10^{-31} ext{ kg}
ext{Ratio} = rac{ ext{Mass of proton}}{ ext{Mass of electron}} = rac{1.6726 imes 10^{-27}}{9.1094 imes 10^{-31}} \n
ext{Ratio} ext{(approx)} = 1836 ext{ times}.
