How have chemists changed the periodic table over time?

A. They have used the table to name elements.

B. They have used the table to discover subatomic particles.

c. They have organized elements alphabetically in the table.

D. They have added new elements to the table.

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answer: option (a) is the correct answer.

explanation:

the measurement of hydrogen ions in a solution is known as ph.

if ph of a solution is less than 7 then the solution is acidic. if ph of a solution is greater than 7 then the solution is basic.

when the ph of a solution equals 7, then the solution is considered as neutral.

the ph of pure water is 7, therefore, it means that concentration of hydronium ions equals that of hydroxide ions.