The fixed number is the sum of protons and neutrons. Because we have actually a mass number of 65, that means the amount of protons and neutrons include up to 65.

You are watching: Mass number 65 and 36 neutrons

The variety of neutrons provided is 36. We deserve to take the distinction of the fixed number and the number of neutrons to acquire the atomic number, or the number of protons.

65-36= 29 protons.

Since we gained 29 protons, walk to the routine table that elements and find number 29 and also you will obtain your facet symbol. The symbol will certainly be Cu, or Copper.

The inquiry does not tell united state that the copper has either a optimistic or negative charge. The will average that the copper will be in its floor state. An atom in the floor state will have the very same amount of electrons together the number of protons.

Therefore, the copper atom has actually 29 electrons.

The atomic number the selenium is 34. Due to the fact that atomic number represents variety of protons, that will be 34.

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