For a barometric pressure of 287 kPa (abs) ± 15 kPa and air temperature of 130 ○C ± 1 ○C: (a) Calculate the relative uncertainty in gas density determined from the ideal gas law. (b) Which of these measurement uncertainties, pressure or temperature, is the largest contributor to the the relative uncertainty in air density? (c) Determine the absolute uncertainty in pressure required to have a relative uncertainty in density below 5% in exercise 1a.

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.  

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