Jan 10, 2017 · Context is important. C is the atomic symbol for carbon and can represent not only the element, (but one or more) atoms of the element, as well as the element as it exists in the understood (implied) conditions. Same is true for O or N or actually any element. However, elemental O and N are both commonly found as diatomic molecules O 2 and N 2.

Nov 25, 2018 · I think what you may find most helpful is to know a bit of the history of element discovery and atomic theory. The first pure substance containing only the element oxygen to be isolated was dioxygen ($\ce{O2}$), in 1774, though it was called "dephlogisticated air" until 1777 when Lavoisier used the term "oxygen" for the first time. This was ...

Jul 5, 2019 · Comparing $\ce{O, O- and O^2-}$, the nucleus and inner electrons don't change, so you focus on the number of electrons in the outer shell. Comparing isoelectronic species such as $\ce{O^2-, F-, Ne, Na+, Mg^2+}$ , the number of electrons stays the same, but the nuclear charge (and the effective charge) change, so you would focus on that.

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 ...

Sep 5, 2015 · A pure sample of an element contains only atoms of that type: for example, a pure sample of iron contains only atoms with 26 protons. Water, on the other hand, is not an element: a molecule of water consists of two hydrogen atoms (one proton each) sharing electrons with an oxygen atom (eight protons).

Sep 17, 2015 · I was tought that an element is a substance that consists of only one type of atoms, meaning the number of protons is the same for every atom. Is this definition sound? In case it is sound: Since ozone gas only consists of oxygen atoms, would it be correct to say that ozone gas, as an entity, is an element?

But when both the elements are non metals or metals, the one with the lower atomic number would come first. for example:- H 2 O,CO 2,HF,etc. But why is it that hydroxide is OH- and not HO-? Also why is methane CH 4 and not H 4 C?

Oct 18, 2015 · Step 1: Find the Molar Mass of Adrenaline. To do this, you must need to know its chemical formula which is $\ce{C9H13NO3}$.

Jan 11, 2015 · The answer given is $\ce{O}$ although in the periodic table $\ce{Br}$ is closer to Group 18 (noble gases). Why is the answer $\ce{O}$ then? inorganic-chemistry

Dec 28, 2015 · I notice that out of all of group 16 oxygen is the only element that can form a double bond. This premise is not true. Sulfur in fact forms double bonds in many organic compounds. Selenium and tellurium both form double bonds with triphenylphosphine as triphenylphosphineselenide and triphenylphosphinetelluride.