21 protons and 24 neutrons in the only stable for. But there can be as few as 15 and as many as 39 neutrons.
The element Scandium (Sc) has 21 protons in its nucleus, which can be determined using its atomic number. To find the number of neutrons, we can subtract the atomic number from the atomic mass: Scandium has an atomic mass of approximately 45. This gives us 45 - 21 = 24 neutrons in a Scandium atom.
Because its atomic number is 21, it has 21 protons, 21 neutrons, and 21 electrons.
21
To figure this out look at the mass number of scandium. It has a mass number of 45(im rounding it up to keep it simple). The mass number is the number of protons and neutrons that form the nucleus added together. So if we know 24 of these 45 particles have to be neutrons then there must be(45-24)= 21 protons. To check this awnser we look at the atomic number(the one above the symbol for the element) and we can see that it is 21 for scandium meaning our awnser is correct.
No.of protons of scandium is 21 (ATOMIC NUMBER) ATOMIC NO=no.of proton or electron MASS NO=no of proton+ no.of neutron
Number of neutrons = mass number - atomic number = 49 - 21 = 28
Neon has 10 protons and 9 neutrons.
Sc is actually atomic number 21, there are 21 protons, 21 electrons, and usually 24 neutrons
Oxygen is a p block element. It has 8 protons and neutrons.
Each element has a different number of protons and neutrons. So it changes for each element.
The number of protons determine what element it is, the number of neutrons determine what isotope it is.
Boron has 5 neutrons and 5 protons for its most common isotope