The number of neutrons (and the fact that C14 is radioactive).
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.
They have a different number of neutrons.
An isotope.
No, bicarbonate is not an isotope. Bicarbonate refers to the chemical compound with the formula HCO₃⁻, which is an anion formed from carbonic acid. An isotope, on the other hand, refers to different forms of the same element that have the same number of protons but different numbers of neutrons. Bicarbonate can contain isotopes of its constituent elements, but it itself is not an isotope.
An element is a class of substances An atom is the smallest possible piece of an element. An isotope is an electrically charged atom.
Because each isotope of an element has a mass different from any other isotope of the same element, and the atomic mass of an element is an average, weighted by the proportion of each isotope, in the naturally occurring element.
an ion has a different number of electrons and an isotope has a different number of neutrons then listed on the Periodic Table or your sample
An isotope of an atom has the same number of protons but a different number of neutrons compared to the common form of that atom. This results in isotopes having the same chemical properties but different atomic masses.
Neon-20 is considered an isotope because it has the same number of protons as the regular isotope of neon (neon-22), but a different number of neutrons. Isotopes are variations of an element that have the same number of protons but different numbers of neutrons.
An isotope is an element that has the same number of protons but a different number of neutrons. Isotopes of an element have similar chemical properties but may differ in atomic mass due to their varying neutron count.
none
... an unstable isotope to a more stable isotope by emission of some type of radiation (alpha, beta, or gamma).