Molecule: Two or more atoms or elements combined together are called a molecule. Compound: Two or more elements combine together to form a compound. The smallest unit of a compound is a molecule. Compounds possess different characteristics compared to constituent elements. Example: $\ce{H2O}$. $\ce{H}$ is highly combustible $\ce{O}$ helps in ...

You either have an atom or a molecule. From Wikipedia: "A molecule is an electrically neutral group of two or more atoms ...". Furthermore, "Elements" can either refer to the species of an atom, e.g. $\ce{O}$. In this case it is not a molecule! Or it refers to the compound an element forms, e.g. $\ce{O2}$. In this case it is not an atom ...

Sep 15, 2022 · In that bottle, if we find that all atoms have 18 protons, we can label it as an argon gas, since each atom has 18 protons. Now coming to your main question: What about Fe vs. $\ce{O2}$. Iron is clearly an element by elementary definitions. You can say that $\ce{O2}$ is a molecule formed by two identical chemical elements, called oxygen.

Dec 13, 2019 · Any constitutionally or isotopically distinct atom, molecule, ion, ion pair, radical, radical ion, complex, conformer etc., identifiable as a separately distinguishable entity. Molecular entity is used in this Compendium as a general term for singular entities, irrespective of their nature, while chemical species stands for sets or ensembles of ...

May 15, 2019 · But the answer to the question is no, a hydrogen molecule is still bigger than a hydrogen atom. $\dagger$ But just barely. Define the edge of an atom or molecule as the point where the electron density equals that at a distance of $\pu{1 Bohr}$ ( $\pu{0.529 Å}$ ) from the nucleus in a hydrogen atom.

Jan 10, 2017 · O is a singular oxygen atom. O 2 is a molecule made of two oxygen molecules. Our atmosphere is made of mostly O 2, which our bodies have evolved to breathe. We breathe in O 2 and cellular respiration requires it (C 6 H 12 O 6 +6O 2 →6CO 2 +6H 2 O). O is oxygen, while O 2 is dioxygen.

Mar 17, 2013 · You can find the hybridization of an atom by finding its steric number: The steric number = the number of atoms bonded to the atom + the number of lone pairs the atom has. If the steric number is 4, the atom is $\mathrm{sp^3}$ hybridized. If the steric number is 3, the atom is $\mathrm{sp^2}$ hybridized.

Sep 5, 2015 · An atom is a thing; an element is a type of thing. An atom is a collection of protons, neutrons and electrons. A single, isolated atom in its neutral state has some number of protons, the same number of electrons and some number neutrons (about as many as protons for the lighter elements, up to about 50% more, for heavier elements).

Oct 2, 2021 · The size of the atom is therefore only defined by the electron shells (orbitals), which in turn depend on the nuclear charge. Your intuition about more electrons leading to a larger atom is correct, but more protons actually lead to a smaller atom. Which effect dominates depends on whether or not an additional electron finds a place in an ...

Sep 20, 2021 · The gram-atom is a very old terminology (mainly historical now). When you express the atomic weight of an element or a molecular weight in grams, it was called gram-atom or gram-molecule. Note the hyphen. Your second and third quoted answers are quite wrong. As a corollary, 1 gram-atom or 1 gram-molecule contain the same number of particles.