Avirus has a mass of ×9.010−12mg and an oil tanker has a mass of ×3.0107kg . what is the mass of one mole of viruses?

Avogadro's number is just a constant and without units. It is alike to a dozen or a gross, only much bigger. 1 mole means that the number of particles existing is 6.022×10²³.

If 1 virus has a mass of 9.0×10^-12 mg, then 10 viruses would have a mass of (9.0 × 10^-12) × 10 = 9.0 × 10^ -11 mg. Likewise, a mole of viruses will have a mass of (9.0 × 10^-12) (6.022×10²³) = 5,419,800,000,000 mg = 5.4 × 10^6 kg, correct to 2 significant figures. 

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step-by-step explanation:

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.