True or False ? The pH scale is a measure of oxygen concentration in a solution.
The pH scale indicates the concentration of H+ in a solution.
The pH scale ranges from 0 to 14.
Neutral solutions have a pH of 7.
Solutions with a pH greater than 7 are acidic.

Solutions with a pH greater than 7 are basic (alkaline).

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

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since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

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