In order to use a pipet, place a at the top of the pipet. Use this object to fill the pipet such that the of the liquid is even with the volume line. Release the liquid, touching the tip of the pipet to the side of the container if necessary to release the last drop the pipet tip.

The correct answers are "bulb or pump; meniscus; outside".

Explanation:

Pipets are one of the most used devices in any laboratory. These apparatus are useful to transfer liquid solutions from one container to another. The first step is to place a bulb or pump to the top in order to remove all the content of the pipet. Second, fill the pipet such that the meniscus (the curved surface of the liquid) is even with the volume line according to the desired volume to be transferred. Third, release the liquid into the second container and release the last drop outside the pipet tip.

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.