This is one of John Dalton's four postulates in his Modern Atomic Theory of Matter.
My physics textbook says that John Dalton discovered that atoms of the same element have the same mass, but I don't know if that is the same as saying that they are identical.
No one. The atoms of different elements are notthe same. Each element has its own unique atomic number, which is the number of protons in the nuclei of its atoms.
This was John Dalton.
rutherford
Such a substance is always an element.
Element
einsteinium (atomic number 99) was the element named after the scientist that created e=mc2 or Albert Einstein.
Noble gasses are nonreactive and would prevent air from entering the container, protecting the "super reactive element" from exposure to air that it might react with.
An atom of any element should contain identical atomic numbers.
atoms are of an element are the same becasue the are all made from identical particles. there is no way to distinguish one electron from another electron. the same is true for neutrons and protons. so by virtue of the fact that its constituents are identical, all atoms of the same element are identical.
Each atom of an isotope of beryllium (or of another element) is different from the atoms of an other isotope. But all the atoms of an isotope are identical.
By looking down its column called a group
They are identical.
Yes, an element is composed of millions of identical atoms.
an element
Such a substance is always an element.
The number of electrons in isotopes is identical.
Because the existence of isotopes was discovered not all atoms of an element are identical.
a scientist
what element is used and why do scientist chose it
Yes, this scientist was Ernest Lawrence.