Hydrogen.
An element is composed of atoms all with the same proton number(they are the same type). The only way the atoms in an element can vary is in the number of neutrons they have.
No, they can't. Atoms (be careful of the difference between atoms and ions) can only have different numbers of neutrons, and those are called isotopes.
The number of protons defines the element. If an atom has six atoms, then it can only be carbon. If it has six neutrons, then it is 12C.
Atoms of the same element differ in the number of neutrons in their nuclei. All atoms of a given element have the same number of protons, of course. The number of protons in a nucleus determines which element the atom is. But the number of neutrons can vary, and these different "versions" of a given element are called isotopes of that element. See the related question, which is linked below.
An atom of one of the few elements that have only one radioactively stable isotope naturally occurring. Even this is not quite literally true, because all atoms have radioactively unstable isotopes that have different numbers of neutrons.
Atoms of the same element with varying numbers of neutrons are isotopes.
Some elements have isotopes - atoms with a different number of neutrons.
Isotopes are atoms of the same element that are only different by the number of neutrons they have
Atoms of all elements can have neutrons in them. Only the element hydrogen has an isotope whose atoms do not contain neutrons, but all other isotopes of hydrogen have neutrons in them. In the heavier elements the number of neutrons always exceeds the number of protons in the atom.
An element is composed of atoms all with the same proton number(they are the same type). The only way the atoms in an element can vary is in the number of neutrons they have.
Atoms of the same element that have different numbers of neutrons are called isotopes. An isotope is known by its mass number, which is the sum of the protons and neutrons in its nucleus.
You think probable to isotopes; only the number of neutrons is different.
The number of protons in the nucleus of an atom defines the element. An atom which as 6 protons will be Carbon. The atomic weight of an element depends upon not only the proton but also the neutrons in the nucleus. Atoms of the same element with different numbers of neutrons are called isotopes. There are three isotopes of carbon: carbon 12 (with 6 neutrons) and carbon 13 (with 7 neutrons) are stable, and carbon 14 (with 8 neutrons) is slightly radioactive and decays by emitting neutrons to carbon 12.
No, they can't. Atoms (be careful of the difference between atoms and ions) can only have different numbers of neutrons, and those are called isotopes.
The number of protons defines the element. If an atom has six atoms, then it can only be carbon. If it has six neutrons, then it is 12C.
A pure element contains one sort of atoms, and all the elements have the same number of protons (which define the element). But the atoms can have different masses, so called "isotopes" (see link). Thus, chemically there is only one kind of atoms in a pure element, but there can be several physically different kinds of nuclei in a pure element.
An element is made up of only one type of atom. Atoms of the same element have the same number of protons in their nucleus, which determines the element's chemical properties. Elements are the simplest form of matter and cannot be broken down into simpler substances by ordinary chemical means.