How many neutrons does element x have if its atomic number is 21 and its mass number is 95?

Which statement about the stamps is correct?

An electrons position cannot be known precisely only it's probability of being in a certain location can be known

The table describes how some substances were formed substance 19 description formed by boiling pure water formed by combining three hydrogen atoms to every nitrogen atom formed by adding 5 g of sugar to 1 l of water formed by compressing carbon under high pressure based on the given descriptions, which substance is most likely a mixture?