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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).
The term is also used to describe a collective of the same atom (element). A bar of gold (Gold being an 'element'; a chemical class) is said to be an element itself. Molecules are a group of atoms covalently bonded to each other (which can be considered a 'direct connection', if you will). The molecule can consist of atoms of the same element ...
answered May 25, 2017 at 21:28. Add a comment. 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.
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 ...
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).
Diatomic element is a kind of molecule in which two atoms of the same or different elements have combined chemically to form a molecule. If we restrict ourselves to the context of elements, then diatomic element is one among various allotropes of the element. Oxygen is found in nature as diatomic and triatomic (ozone).
But saying molecules are made of radicals is weird. A radical has an odd number of electrons at its outer shell, it is chemically unstable, although electrically neutral. Atoms can be neutral and chemically stable, as in the noble gases, which fully comply to the octet rule. Thus an atom being a radical and vice-verse is more of a "chemical ...
It contains almost all the mass of the atom. It is positively charged and hence keep the electrons in orbit via electromagnetic force (attractive) A nucleus contains protons which determine which element the atom is of. That's all. And, no, it is safe to assume that nuclei don't move within the atom, they are stationary, mostly for their large ...
They bundle into group 1 (atoms), and group 1's bundle into group 2's (chemicals), but really it's all just particles that are all interacting. So this makes me wonder, what exactly a chemical is. It is a stable particle system essentially, where atoms combine into larger chunks. atoms. Share.
In this sense, elements are less electronegative (or more electropositive) as you go down any group in the periodic table. However, the difference in electronegativity between hydrogen and sodium is exceptionally large, and correlates with the very different chemistry these two elements show.