a) Which row of the table shows the correct relative mass and relative charge of a proton? Put a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 5 - 2017 - Paper 1
Question 5
a) Which row of the table shows the correct relative mass and relative charge of a proton? Put a cross (X) in the box next to your answer.
| relative mass of proton... show full transcript
Worked Solution & Example Answer:a) Which row of the table shows the correct relative mass and relative charge of a proton? Put a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 5 - 2017 - Paper 1
Step 1
a) Which row of the table shows the correct relative mass and relative charge of a proton?
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Answer
The correct row is C, as it shows the relative mass of a proton as 1 and the relative charge as +1.
Step 2
b) Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The correct answer is B, sulfur (S), as it contains 16 protons, corresponding to its atomic number.
Step 3
c) The electronic configuration of an atom of an element is 2.8.5.
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Answer
This configuration indicates that the element is in Group 16, since it has 6 electrons in its outer shell, and it is in Period 3 as there are three total energy levels.
Step 4
d) A sample of neon contains 90% neon-20 and 10% neon-22.
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Answer
A neon-22 atom has 10 protons, 12 neutrons, and 10 electrons. The relative atomic mass is calculated using the weighted average of isotopes:
ext{Relative Atomic Mass} = rac{(0.90 imes 20) + (0.10 imes 22)}{1} = 20.2 This demonstrates why the sample has a relative atomic mass of 20.2.
