That's Manganese and it has (about) 30 neutrons - - - - BUT your question would have an answer of 11.
atomic mass = number of neutrons + number of protons.
Mass number minus atomic number = number of neutrons
atomic no is the no of protones in a nucleus while atomic mass is the sum of protons and neutrons in nucleus of an atom....
This is the sum of all protons and neutrons in an atom. On the periodic table, it has the average for that element.
Characteristic for an atomic nucleus are the number of protons and neutrons. Tha atomic nucleus is always positive.
Protons
An atomic nucleus contain protons and neutrons; protons and neutrons contain quarks and gluons.
Atomic mass is determined by the number of protons and neutrons in an atom's nucleus.
atomic number is the number of protons in the nucleus or electrons around the nucleus in an atom that is not ionized. atomic mass is the sum of the number of protons and the number of neutrons in the nucleus.
The nucleus of an atom consists of protons and neutrons. The number of protons in a particular nucleus is its "atomic number". The total number of protons and neutrons in a particular nucleus is its "mass number".
the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
For any element, the atomic number is the number of protons in the nucleus. And for any element, the atomic mass is the number of protons plus the number of neutrons in the nucleus. For an element with the atomic number 47 and an atomic weight of 107, it will have 107 - 47 neutrons in its nucleus, or 60 neutrons in its nucleus. Whether or not an atom is a neutral atom or not makes no difference here.