Weight is the magnitude of the force that is required to keep an object at rest in a gravitational field. The weight of an object therefore depends on the local gravity.
Approximating with the standard average Earth gravity (g) with a value of 9.81 m/s2:
W = 9,81* 3,6 kg= 35.316 N (newton)
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Weight of the protons and neutron in the nucleus. Electrons weigh so little, it wouldn't affect the outcome unless rounding to about 36 digits.
1 kilogram = 1000 grams so 36 g = 0.036 kg
Density = mass/volume, so:36 grams/ 12 milliliters3 grams/ milliliter
84 is the mass number of a stable isotope of krypton, 84Kr has 36 protons and 48 neutrons in its nucleus that give it an atomic weight of 84.
density = mass/volume = 36 g / 12 cm3 = 3 grams per cm3