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Use the periodic table to help you answer the following question - Edexcel - GCSE Chemistry - Question 3 - 2017 - Paper 1
Question 3
Use the periodic table to help you answer the following question. Which of these metals will form coloured cations? Put a cross (✗) in the box next to your answer. ... show full transcript
Worked Solution & Example Answer:Use the periodic table to help you answer the following question - Edexcel - GCSE Chemistry - Question 3 - 2017 - Paper 1
Step 1
Which of these metals will form coloured cations?
Answer
The metals that form coloured cations are typically transition metals due to their ability to lose different numbers of electrons and form ions with unpaired electrons in d-orbitals. Therefore, the correct answer is to place a cross (✗) next to chromium, Cr.
Step 2
Explain, in terms of the structure of their atoms, why caesium is more reactive than lithium.
Answer
Caesium is more reactive than lithium due to its atomic structure. Caesium has a larger atomic radius, meaning its outer electron is further from the nucleus. As a result, the force of attraction between the nucleus and the outer electron is weaker, making it easier for caesium to lose that electron compared to lithium, which has a smaller atomic radius and a stronger attraction.
Step 3
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Step 5
Explain why filament light bulbs were filled with argon rather than left with air inside them.
Answer
Filament light bulbs were filled with argon because argon is an inert gas that does not react with the hot filament. This prevents the filament from oxidizing and burning out quickly. If air, which contains oxygen, were inside the bulb, the filament would react with oxygen and burn out rapidly. Thus, using argon helps prolong the life of the bulb.