Yes, 25 protons and 30 neutrons form the nucleus of Manganese's most stable isotope.
The number of neutrons in the nucleus of an atom varies for each isotope of the element. Atomic number 25 means the atom contains 25 Protons, and it is the element Manganese (Mn). Manganese has 4 isotopes 52Mn, 53Mn, 54Mn & 55Mn. Take the number of protons (always 25 with Mn) from the isotope number and you will have the number of Neutrons in the nucleus. eg 55Mn will have 30 Neutrons.
It is an atom of the element manganese (symbol - Mn).
All neutrons (of all elements) are located in the nucleus (as all ptotons are)
The element with 135 neutrons in its nucleus is Xenon, which has an atomic number of 54.
That's Manganese and it has (about) 30 neutrons - - - - BUT your question would have an answer of 11.
All elements have neutrons and protons within the nucleus.
Neutrons are found in the atomic nucleus of an element, along with protons. They have no electrical charge and help stabilize the nucleus. The number of neutrons in an element can vary, leading to different isotopes.
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The smallest unit that shows the properties of an element is an atom, and yes, an atom has protons and neutrons in the nucleus.
The isotope of zirconim, 91Zr, has 51 neutrons. In order to solve this problem, one must know that an element's atomic weight is the average of its number of protons and neutrons (only neutrons are variable). Since the atomic number is the number of protons, the atomic number subtracted from the atomic weight gives the number of neutrons. An element in period 5 that has this many neutrons is found to be zirconium (the isotope 91Zr).
Ruthenium typically has 102 neutrons in its nucleus.