chemistry question. elements exist as atomic species, molecular species...?
825026
what you need to do, get a SI data book, and look up their natural state. not bonded with anything else, and possibly itself.\n\nPhophorus - white: molecular (P4). red: Chain. Black: Layer\nIodine - molecular (I2)\nMagnesium - hexagonal closest-packing\nNeon - cubic closest-packing\nArsenic -grey: 3d structure - Layer formation. yellow: molecular As4\nSulfur- molecular S8\nBoron - complicated structure.\nSelenium - grey: chain, Red: molecular: Se8\nGallium - Complicated\nCesium - body-centred cubic\nOxxygen - O2, O3 molecular
99054
Not only sodium rather all elements of s and p orbitals with 1 or 2 valency do not exist as naturally found pure elements.\n\nThis is because of their very high reactivity with majority of substances present in the atmosphere, sea and earth crust.
1169808
The periodic table is organized by a few things, but most noticably is the amount of protons located in the nucleus of an atom.\n\n1 Hydrogen, 2 Helium, 3 Lithium, 4 Beryllium, 5 Boron etc\n\nYour question cannot be answered unless we found that there was a limit to the number of protons allowed to be in the nucleus.  As of right now, there is no pursuading evidence that there couldn't be an element with 603 protons, 2005 protons etc...\n\nSo we must admit that there could be an infinite amout of elements (though in the real world there isn't anything that is "Infinite") so theoretically we know 111 elements out of infinity. \nWhich is 0%.
504733
The atomic number of an element is equal to the number of electrons it has. Do you mean something more than that?
498491
This is an subject area where vocabulary is vital for clear understanding, to a degree I am not capable of, however the stuff that you ask about are so small that the only way to attempt to prove their existence is through mathematical formulae based on what we suspect to be true. Our lack of understanding on this subject, which is still very voung, means the answers available are sketchy at best compared to our understanding of molecular structure or atomic structure.\nWhat is known so far can be found in places like the noetic sciences knowledge centre, or wikipedia.
600134
We, along with everything else in the world, are made up of atoms. Atoms are the basic building block of all matter.  The periodic table lists the different "elements" in the universe. Each element is made of a unique kind of atom, and there are no other kinds. For example, you can have oxygen atoms, or carbon atoms, but there are no plastic atoms. Anything more complex than the elements is made by sticking atoms together to form molecules - you *can* have a plastic molecule.\n\nAtoms consist of a nucleus, which contains protons (positively charged particles) and neutrons (no electrical charge.) The protons and neutrons are the heavy part of an atom. Electrons (negatively charged particles) orbit around the nucleus. \n\nThere are always the same number of protons and electrons, so the positive and negative charge cancel each other out. The number of neutrons can vary. Adding the number of protons and neutrons will give you the "atomic mass" of an element.
232753
An atom is the smallest divisible partical that can exist on its own. Its divisibble because it contains three subatomical particals known as protons, neurons, and electrons while an element is a substance that cannot be split into two or more substance like the periodic table has a list of different elements, so examples of elements are those on the periodic table and atoms make up matter.
873154
Substances exist if they have a volume. Anything that has no volume is only imaginary.\nMasses exist in a form of volume structure with a mixure of space substance.\nHence,some masses are so small that they  cannot be visible. That doesnot means they dont exist or that they are considered massless because of being so small. This has been a misconception in the case of Photons. The atomic mass structure shown in the Periodic talble of elements is basically made up of complex atomic structures.. Never the less the atoms are all composed of the same substance,and all these substance have volume.\nSo atoms exist as they do because they are entity with volume. If it it was not so, they would not exist in our physical world.\n\nNow if they are substances outside of the Universe which are different,we have no scientific way presently to observe them.\n\nSo when Physics theories talk about masseless substance such as Photon and neutrinos etc. they are only conjecturing. And I only believe what appears to be real with actual positive proof.\n\nThe states in which atomic structures appears depend on their response to gravity pressure.and the temperature inside the atoms.\n At different temperature mass structure can appear as solid ,liquids ,gas or a gaseous ionized state called plasma.And most important of all the state of space substance which is the fifth state of matter.\nThese five states of Nature had been pondered upon by the Ancient Greeks such as Aristotle and others.
790203
Element: a substance where all the atoms are identical\n(Fe,Al,C,etc.......)\n\nCompound: a substance where atoms are combined by ionic or covalent bonds.(CO2,NaCl,etc.....)\n\nMixture: a substance where elements and&#92;or elements are in the same phase,but are not combined with strong bonds.(Hydrated salts. NaCl.H20, water and salt are combined as a mixture, iron powder with magnesium powder are a mixture,but they are not actually bonded.)
1170146
There are traditionally only 4 elements - Fire, Water, Earth and Air / Wind. These were believed by the ancient greeks to be the fundemental basis of life. \n\nScientifically, there are not only several elements needed for life to exist but also certain conditions of environment also - the best elemental mix would struggle to form life in the near vacuum of space.\n\nAll known life is carbon based. The other elements needed (depending on environment) would include hydrogen, oxygen, and nitrogen.\n\nIf you are talking about throretical extra terrestrial life, this could be silicon based and have an entirely different chemistry to anything we would recognise.
831018
http://www.chemicalelements.com/elements/be.html\n\nthis website may help you!!!!!! ( hope you get an A)
873092
Matter can exist in either a liquid, solid, or gaseous state.  \nA) Iron nail is a solid\nB) Gasoline is a liquid unless you are speaking of the fumes that can be seen or smelled and then it is a gaseous state.
989236
I'm not quite sure what you mean by "H2 molecules form higher elements."  An element is a single atom, such as Br, or Co, so molecules do not form atoms, rather, atoms form molecules.  There are various organic reactions, such as oxidation, fermentation, esterification, polymerization, condensation, and saponifacation, however, when CO2 decomposes, the products would most likely be C and O2, which could be shown by CO2 + heat ---> C + O2, since this is an endothermic reaction.
915836
A compound contains more than one element (H2O).  A molecule may contain atoms of one element only (O2).
878474
Um, there's over a hundred elements.  I'm not going to name them all for you.  Look at a periodic table.  I'm sure there's one in your chemistry book.
63220
Oxygen is an element, but it's so reactive, that two atoms of oxygen usually bond to form the O2 molecule. Also, Ozone forms when three oxygens bond, forming the O3 molecule.
525984
Diatomic molecules contains two atoms (either same atoms or two different). Examples are, H2, O2, N2, Cl2, CO, NO etc.