Other than isotope. The word starts with an "A".
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they are called allotropes.  An example is diamond, and graphite. Both are pure carbon, but the bonding structures are different.  another example is O2 (oxygen gas) and O3 (ozone gas). Both are pure oxygen but the molecules are different.
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'A Person' gives a short, simple, and correct answer. \n\nIt is simply when two atoms (ions [thus the name]) join to form a compound. One ion is + the other -.\n\nGet an "A".
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The first means something like "woah."\n\nCheck out the following link, which provides a helpful little cheatsheet.
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Eyes. Eyes are pretty high up the list even if "T and A" were included!\n\nThey might be 2nd and 3rd, though. ;)
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It says:\n\nDanger. Evaporating chemical.
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"E" \n\n(eternity -> eternitE)
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the word is 'nothing'\n\n=)
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please start with S !!!! LOL ... what if doesn't start with an S ???\nok ... if you insist ... it's gotta be Siavash G.
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mostly acids. do your own homework
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phosphate\nsulfate\nnitrate\nperchlorate\n\nThe oxidation state of the anion will not change.  These anions simply have a proton (or a couple protons) as the cation instead of a salt.  The name of the acid directly reflects the anion's name.  All the acids you listed had an -ic suffix which implies a fully oxidized state.  The per- prefix on perchloric sugggest it is one step beyond fully oxidized.  \n\nFor example, another oxoacid is sulfurous acid.  The -ous suffix informs us that the oxidation state of the non-oxygen element is lower than those with an -ic ending
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If A represents the percentage of the atoms that are isotope A, and B represents the same thing for isotope B, and if A and B are the only isotopes, then A+B has to equal 100%, which is 1.\nSo:\nA+B=1\nA=1-B  (and B=1-A)
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DNA, perhaps?  Deoxyribonucleic acid, that is.
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Well I think its pretty self-explanatory. It says A equals to something, so I would go with A.
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element ( I know element is 7 letters , you said 6 but was it 7? did you not count the e?) \nand i am thinking of the next one\nhmm..... _e _ _ _....\ngot it, decay !\n\nthat was kind of fun :)
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The simplest example is "duo".  There's also a number of words with duo as a prefix:duotone, duopoly, duodenum, duologue, etc.\nVacuole is a nice one if you're into botanical sciences.  Fluorine if you're into chemistry (and many words containing 'fluor', like fluoroscopy, fluorite, fluoride.)\nContinuo, that's a musical term.\nMuon, a subatomical particle (also tauon, and no doubt other examples in the field of particle physics).\nThere are plenty of "regular" English words with uous suffixes... continuous, flexuous, sinuous, tenuous, etc.
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For this kind of information, wikipedia is the ideal start. Additionally, visit a library and check any chemical dictionary or encyclopedia. While the language may appear strange, the information you want will be recognizable with some patience.
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See if this article has a diagram\n\nhttp://jchemed.chem.wisc.edu/Journal/Issues/1999/Apr/abs542.html