No, that is why we have isotops. Example: hydrogen can have 0,1,2 neutrons
isotops
Atoms of same element with same atomic number,which have different mass number is called isotops.
The number of Neutrons in an isotope will always be different.
Just about anywhere.
Four
No, the properties of individual atoms and the compounds they form are not always very similar. Atoms have unique characteristics based on their atomic structure, while compounds exhibit different properties that arise from the interactions between the atoms within them. The combination of different atoms in a compound can lead to new properties that are distinct from those of the individual atoms.
An oxide always has at least one oxygen atom as well as at least one atom of a different element.
Isotopes are atoms of the same element with different numbers of neutrons. Some elements have more than one isotope and some don't. The isotopes of an element are chemically identical, they just differ in mass. There is nothing special about any particular isotope, elements with them are just as 'regular' as the few which don't.
when the protons changes, then the two atoms belong to two different elements.
No - different isotopes of an element have different numbers of neutrons. All atoms of an element will have the same number of protons.
Democritus believed that atoms were indivisible and indestructible particles that make up all matter. He thought that different combinations of atoms created different substances.