How many neutrons are in the nucleus of an atom with an atomic number of 25
(use periodic table for mass)

The neutron is 30

Explanation:

The element with atomic number of 25 is Manganese. it has a mass number of approximately 55.

Therefore, the neutron number = Mass number - Proton number (i.e. atomic number)

                                         = 55 - 25

  Neutron number            = 30

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: