Which of the models shown below best represents the modern understanding of the structure of the atom? Two small green balls and two small red balls labeled with plus signs are clustered at the center of a larger circle. Two small yellow circles labeled with minus signs lie on the outer circle, directly across from each other.
Model A

A red ball is shown, with a plus sign faintly visible on it. The ball contains 10 smaller orange balls, each labeled with a minus sign.
Model B

Atomic Structure
Model C

Photos by Phrood and Furmanj

Model A

Model B

Model C

58 km per hour : d

the answer is true.

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.  

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).