Chemistry, 03.04.2020 07:48, poop2351

Can two isotopes of the same element have different numbers of protons?

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Chemistry, 23.06.2019 01:00, zitterkoph

Which of the following is a physical change? a. burning a piece of wood b. sawing a piece of wood in half c. rust forming on an iron fence d. a copper roof changing color from orange to green