1. Atomic number is the number ofin an atom .
A)neutrons
B)protons
C)electrons

B. Protons

Explanation:

The atomic number or proton number of a chemical element is the number of protons found in the nucleus of every atom of that element.

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.

            and  

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.  

yes

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