Which discovery caused scientists to revise the model of the atom that showed electrons
as being spread throughout a cloud of positive charge?

A. Electrons were found to have a negative charge.
B. Atoms for different elements were found to have unique atomic numbers.
C. A small, dense area of positive charge was discovered in the center of the
atom.
D. Scientists determined that the exact location of an electron could not be
calculated.

може ли да зареждате повече информация, моля

it is stable as it is in group 0 which have full outer shells of electrons

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.