2. Rubidium
3. Antimony
4. Ytterbium
5. Einsteinium
the minimum frequency of radiation that will produce a photoelectric effect
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The element that has been oxidized is Al ( Answer A)
Explanation
if the oxidation number of an element is greater in the product side than the reactant side then the element has lost the electrons . This mean that the element has been oxidized.
Al is oxidized because it move from oxidation state Zero(0) in reactant side to oxidation state 3⁺ in product side.
This implies that Al loses 3 electrons.
