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 ...

2017年1月10日 · 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.

2015年9月5日 · 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).

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 ...

2019年5月15日 · 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.

2019年12月13日 · 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 ...

2014年8月15日 · atom/isotope; salt; I am rather confused about these terms, because my tutor uses particles and molecules (and elements) as if they were the same thing. As for the rest, I want to know how to distinguish between general (such as chemical species, substance) and specific terms (such as particle, atom, isotope, salt).

the molecule will not be planar if there is an $\ce{sp^3}$ hybridized carbon (or nitrogen) atom or two $\ce{sp^2}$ hybridized atoms of carbon/nitrogen which are separated by an even number of double bonds and no single bonds. Otherwise, its structure allows it to be planar.

2021年3月5日 · By far, my understanding is that a molecule is made up of atoms bonded together. For example, a molecule of water ($\ce{H2O}$) has 2 hydrogen atoms and one oxygen atom. However, when it comes to Avogadro's number, I'm getting confused because it mixes the concept and treats it like it is the same.

2015年4月2日 · But, then I read that a single oxygen atom can bind with another element to form a compound, but it's a diatomic element with two atoms. Please can someone enlighten some clarity on this subject. Also, it would help to see some examples to see the differences and context of how these diatomic molecules and elements interact.