Which of the following does ((not)) describe a single-displacement reaction?

a. occurs when one element replaces another element in a compound.

b. ab+c > ac+b

c. occurs when a substance is broken down into two or more simpler substances.

d. also called a redox reaction

The correct answer is option C.

Explanation:

Single replacement reaction : It is a type of chemical reaction in which element exchange their position with the position of another element in its compound molecule.

It is also called redox reaction because one element getting oxidized and another one getting reduced.

Hence, the correct answer is option C.

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.