The volume of a given mass of an ideal gas at constant pressure is 1. directly proportional to the kelvin temperature
2. directly proportional to the celsius temperature
3. inversely proportional to the kevin temperature
4. inversely proportional to celsius temperature

inversely proportional to the kelvin temperature

Explanation:

PV=nRT

1. directly proportional to the kelvin temperature

Explanation:

Refer to the Ideal Gas Law, PV = nRT. As the temperature, which is always in Kelvin when part of the Gas Law, increases, the pressure would increase as well, meaning that they're directly proportional.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

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.