What is fermentation​

Explanation:

fer·men·ta·tion

/ˌfərmənˈtāSH(ə)n/

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noun

the chemical breakdown of a substance by bacteria, yeasts, or other microorganisms, typically involving effervescence and the giving off of heat.

the process of fermentation involved in the making of beer, wine, and liquor, in which sugars are converted to ethyl alcohol.

ARCHAIC

agitation; excitement.

"I had found Paris in high fermentation"

Fermentation is a metabolic method that creates chemical changes in natural substrates through the action of enzymes.

Explanation: hope this helps :)

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.