Option A is the correct answer
Answer:Gold
Explanation: it is a pure element on the periodic table
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Answer:
(C) A metal rail rusting Is an example of chemical change.
Explanation:
When a chemical change takes a place a new substance is formed.
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12
Neon is the 10th element and has 10 protons. The mass of an element is the sum of the protons and neutrons.
22-10=12