There is no such thing. There are carbon atoms of varying properties, and isotopes. There is no such thing as an "human carbon atom."
The mass number of an element like calcium is the sum of the number of protons and neutrons in its nucleus. Calcium has 20 protons, so to find the mass number, you would look up the number of neutrons in the periodic table and add that to 20.
This chemical element is calcium (Ca).
Calcium is in group 2/IIA, so the other elements in that group would be expected to behave most like calcium.
Neither of both because it is NOT a mixture at all; it's a (pure) compound (one kind of molecules)
Calcium.
It is element 20.
Calcium is an element. (Ca on the periodic table).
potassium
The main constituent element of calcium is calcium itself, which is a chemical element with the symbol Ca and atomic number 20.
Calcium IS an element, whole and complete.
Calcium is an element.
Calcium hydroxide is not en element it is a compound.
Bones contain the element Calcium (Ca). It is not this element but compounds made out of this element that gives bones their strength. These compounds are calcium phosphate and calcium carbonate.
Calcium bromide is a compound because it is composed of calcium and bromine elements that are chemically bonded together in a fixed ratio.
Calcium is an alkaline element, number 20 on your periodic table.
Calcium (Ca)
Calcium is an element. It is a pure substance made up of only one type of atom, specifically calcium atoms.