A neutral atom of potassium has 19 electrons.
It would be D since it could be unhealthy for you.
We use the following formula to calculate the number of atoms:
n (mol) = N(number of atoms) / NA
N(He) = n(mol) · NA
N(He) = 2,0 moles · 6.02·1023 = 12.04·1023 atoms
With a radius of 3,760 miles (6,052 kilometers), Venus is roughly the same size as Earth — just slightly smaller.
48.0g piece of metal is dropped into 50.0mL of water in a graduated cylinder. The water level rises to 62.4mL.