No
Often, but not always, atoms with an equal number of protons and neutrons in the nucleus are stable and not radioactive.
The number of protons and neutrons is not equal. The equality is not a rule.
protons and electrons will always be = number
Electrons are equal to the number of protons and the atomic number. To find the number of neutrons you must subtract the atomic number from the mass number.
Protons, neutrons, and electrons are subunits present in equal numbers in an atom. The number of protons in an atom is equal to the number of electrons, while the number of neutrons can vary in different isotopes of an element.
No. The number of neutrons has no affect on the number of protons and electrons.
atomic weight = mass of protons + mass of neutrons
If you add the number of protons to the number of neutrons in an atom, you have calculated that atom's atomic mass.
No An atom may have less, the same, or more neutrons than protons. The number of neutrons determine which isotope of an element you have. You do expect the number of protons and electrons to be the same however. If an atom loses or gains an electron to cause the number of electrons and protons to be mismatched we call that an ion rather than an atom.
Protons
The mass number = protons + neutrons
Not all atoms have an equal number of protons and neutrons. They can, but they don't have to. Helium, for example, has two of each, but carbon (always with 6 protons) can have 6, 7, or even 8 neutrons. The more neutrons, the more likely it is to be radioactive. The number of protons and neutrons gives the atomic weight of an atom. All of the various amounts of neutrons that an element can have are called isotopes of that element.