For a quiz, ! : ) how did early chemists determine which substances were elements? a. they knew what substances were mixtures. b. they knew how many protons were in the atoms. c. they knew which substances could not be broken down by chemical means. d. they knew how many electrons were in the outer shell of every atom

b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.

gas

explanation:

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what does the table look like