How many neutrons are in the nucleus of the isotopes of aluminum-25?

Answer 1

The atomic number of aluminum is 13, therefore there will be 13 protons.

The number of neutrons equals the mass number minus the atomic number. For aluminum-25, that will be 25 - 13 = 12 neutrons.

There will be 13 electrons in the neutral atom of aluminum, regardless of which isotope we are considering.

Answer 2

You can determine the proton of any element by finding the element on the Periodic Table. For instance, aluminum is element 13. This 13 refers the the atomic number and the number of protons on the element or in this case isotope. Aluminum protons: 13

Answer 3

When adding the neutrons and protons(also known as atomic number) up of any given element, the mass number is the resulting number. The mass number here is 25 (aluminum-25). To determine the neutrons you have to locate Aluminum on the periodic table and find its atomic number (single digit number), and it is element number 13. Formula: Mass number = neutrons + Protons(atomic number) So solve for neutrons and plug in your numbers Neutrons = mass number - protons Neutrons = 25-13 = 12

Answer 4

The "25" part is the mass number of the isotope. The mass number is the sum of the number of protons and the number of neutrons. You are trying to find out the number of neutrons, but we already know the number of protons using a periodic table because it is the same as the atomic number. If we know there are 13 protons (atomic number 13), then we just take the mass number and subtract it by 13.

25 - 13 = 12

There are 12 neutrons in 25Al