Answer quickly
which device can be used to separate this mixture most efficiently?

a. strainer
b. magnet
c. colander
d. stove top

The answer is A. Strainer

Explanation:

a strainer has multiple small holes that lets liquid pass through but keeps solids on top of it.

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.