Under which conditions will gases best dissolve in liquids?

Explanation:

Gases best dissolve in liquid under low temperature. This is because when you increase the temperature it will cause an increase in kinetic energy. An increase in kinetic energy means there would be an increase in molecular motion of gas particles. This would cause for gas particles to escape to the gas phase thus making it difficult for it to be dissolved.  

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.

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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.  

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