The atomic mass of the most common isotope of carbon is
the element with an atomic number of 4 is
exist in orbitals around the nucleus.
oxygen has protons in the nucleus.
an isotope of an element has the same number of protons but a different number of

Isotopes differ in number of neutrons.

Carbon is an element found in group 14 of the periodic table. It's common atomic number is 12. It also has other isotopes.

The element that has atomic number 4 is Beryllium. The electrons in an atom exist in orbitals around the nucleus.

Oxygen has eight protons in its nucleus. An isotope has a different number of neutrons.

Learn more about isotopes: link

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs