Atoms quiz
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Where were the iron atoms in your blood made?
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More questions about Atoms
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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Where does the colored light in fireworks come from?
Answer: Metal salts
Why: Blue is the trickiest firework color, because its copper compounds glow blue only in a narrow temperature range.
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What keeps electrons inside an atom?
Answer: Electric attraction
Why: Between a proton and an electron, the electric pull is about 10³⁹ times stronger than gravity.
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Which element's atoms give up an electron most easily?
Answer: Caesium
Why: Francium sits below caesium yet holds its outer electron a little more tightly, an effect explained by relativity.
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Which element makes up both diamond and pencil lead?
Answer: Carbon
Why: Pencil 'lead' contains no lead at all: it is graphite, a form of carbon, mixed with clay.
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Sodium has 11 electrons. How many are in its outer shell?
Answer: 1
Why: Shell sizes follow the rule 2n², so the first four shells hold up to 2, 8, 18 and 32 electrons.
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Why do atoms shrink across each periodic table row?
Answer: More protons
Why: Each step along a row adds a proton but no new shell, so the nucleus pulls the same outer shell in tighter.
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