That is atomic number.Mass number can be similar
The atoms of each element have a number of protons that is unique to each element. The number of protons makes one atom different from another.
The atomic number or z number or the number of protons is what makes one atom different from another. The atomic number or z number or the number of protons is what makes one atom different from another.
The atoms of each element have a number of protons that is unique to each element. The number of protons makes one atom different from another.
The number of protons.
Elements are pure substances that cannot be broken down by chemical means. The atoms of each element have a number of protons that is unique to each element. The number of protons makes one atom different from another.
the number of electrons can be different; it makes the element become an ion.
isotopes
The number of protons in the nucleus of an atom distinguishes it from another atom. This number is known as the atomic number and determines the element to which the atom belongs.
One element differs from another element by the number of protons in their atoms. The number of protons in the atom is known as the atomic number. Also one isotope of an element differs from another isotope of the same element by the number of neutrons in their atoms.
uhm... you might want to reword your question it makes no sense
Its protons. The atom changes depending on how many protons it has. See also atomic number.
For a given chemical element, the number of protons does not vary from one atom to another. The number of neutrons can vary to yield different isotopes, and the number of electrons can vary to yield negative or positive ions or the neutral atom, but proton count remains constant.