Achemist is hired by a major petroleum company to do research into developing a gasoline mixture that burns more efficiently in automobile engines. this is best described as research.

applied

Explanation:

According to my research on different research methodology, I can say that based on the information provided within the question this is best described as applied research. This type of research focuses on solving a specific and practical problem, in this situation that practical problem is finding a solution in order for gasoline to burn more efficiently.

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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.