Is bromine an unstable or a stable nonmetal? Why?
921311
Bromine is the only non-metal that is a liquid at room temperature and is a highly volatile and unstable compound.  The reason for this is due to the fact that it has 7 valence electrons, 1 away from being a stable noble gas.  Therefore, bromine is highly reactive in order to obtain the extra electron it needs to be happy.  \n\nPlus it smells terrible.  Another reason why it must be unstable.
916757
Transition metals are stable.  Mercury is a metallic liquid at room temperature.  Diamond and graphite are allotropes of carbon.  H, N, O, F, Cl, Br, I, At form diatomic molecules.  He, Ne,Ar, Kr, Xe, Rn are monoatomic gases at room temp.
935698
nonmetals have much higher ionization energies than metals do. this is because non-metals have more protons in their nucleuses to attract their electrons with. metals do not have as many, as compared to the rows they are in, so the electrons will move away from the nucleus of the metal if given a little push.
488112
http://chemistry.allinfoabout.com/features/nonmetals.html
14501
There is a rule that isobars (isotopes of different elements which have the same sum of protons and neutrons) are stable only if there is a distance of at least 2 protons to the next isobar.\n\nI know of no easy way to predict which isobars will be stable and which won't.
97857
Yeah, it's the greatest electronegativity difference between the two atoms that are forming that bond.  In other words, it's the difference between how far away the two elements are from fluorine, the most electronegative element.  Diatomic molecules like Cl2 are very nonpolar because both Cl atoms are equidistant from fluorine, and HBr is more polar because Br is closer to fluorine than hydrogen.
981423
Except for boron itself, which is a nonmetal, the elements of group IIIA are metals (aluminum, gallium, indium, thallium). Even boron in its elemental state is a hard gray material that might be mistaken for a metal.\n\nThe elements of group IIIA have a valence (number of bonds to atoms other elements) of three. There are exceptions. Thallium often has a valence of 1 as well as of 3. Boron often has a valence of 4 (bonds) because of filling the empty space in its octet from other species from outside.\n\nAs a group, the elements of the boron group decrease in electronegativity as one goes down the column.
197637
Actually, there are a few things wrong with that structure. If the Red atoms are indeed oxygen then the formal charge would be (C4H8O2)2-, the double minus change would make this very unstable. \n\nOxygen is only found by when it is double bonded, which it can't do here since carbon can only have four bonds. The red could be a halide, that is something from the F, Cl, Br and I column. \n\nIf the red guys were bromine then it would be \n2,3-dibromobutane
705127
As mg said, yes indeed, all Halogens' are diatomic along with H, N, O, and even Ar (a Noble Gas!). \n\nA note, however, Astatine is so rare it is usually not considered to be a diatomic. \n\n. . . and a little known fact . . . some metals are diatomic in their gaseous state.\n\nGet an "A".
5699
Hello Partheek. \n    Well it is natural to prefer stability. Like look at yourself. Would you like to be runnung here are there in search of work or would you prefer a good sastisfying job. We all like to be stable in life. So is true with the atoms. They too like to rach a stabler configuration. Hence they try to attain it. Well you know even when you go to sleep, of you think deeper, you sleep because you ned rest. Rest from movement and motion. Hence you grow stabler. See it is all connected. So you dont sleep to attaion the octet but you do sleep to attain stability!!
280779
sodium has atomic no.11\ne.c 2,8,1\nit needs to lose electron to become stable.thus it acquires a +1 chargemaking it Na(+1).\nChlorine has the atomic no 17\ne.c is 2,8,7\nit needs to gain one electron to become stable.thus it acquires a negative charge making it Cl(1-)\ncalcium has atomic no 20\ne.c is 2,8,8,2\nit needs to lose 2 electrons to become stable,thus it acquires a +2 charge making it Ca(+2)\noxygen has atomic no 8\ne.c 2,6\nneeds to gain two electrons to become stable.thus it acquires a -2 charge making it O(-2)\nCarbon has atomic no 6\ne.c 2,4\nit is difficult to gain or lose 4 electrons due to energy considerations.so it usually shares to become stable.thus ,it usually does not form an ion.\nneon has atomic no 10\ne.c is 2,8\nit is already stable and so does not need to lose or gain electrons and hence does not form any ions
699224
HCl - Clear colourless to light-yellow liquid\n\nBromine - gas/liquid: red-brown solid: metallic luster\n\nBromine is the only liquid nonmetallic element at room temperature and one of five elements on the period table that are liquid at or close to room temperature. The pure chemical element has the physical form of a diatomic molecule, Br2. It is a heavy, mobile, reddish-brown liquid, that evaporates easily at standard temperature and pressures in a red vapor (its color resembles nitrogen dioxide) that has a strong disagreeable odor resembling that of chlorine
709274
Magnesium is an element it does not "break down".
402942
An atom is stable when it has a full valence (outer) electron shell.  For the first row on the periodic table, the outer (and only) shell can hold up to 2 electrons.  For the next two rows, the atoms' outer shells can hold up to 8 electrons.  The next two can hold up to 18.\n\nAtoms like sodium, in column 1 of the periodic table, have one electron in its valence shell.  It is very reactive, since it wants to get rid of this extra electron so that its outer shell can be full.\n\nAtoms like chlorine, in the second last column, have one electron missing from their valence shells.  They are also very reactive, since they want to accept an electron to fill the outer shell.\n\nNoble gases are almost totally unreactive, since they have the unique property of having full outer shells without having to give away or accept any electrons.
237935
francium. mercury is technicaly not a metal, it just has a low melting point, low metling points do not make it unstable. if that were the case, then oxygen would be VERY unstable ITS ALREADY TURNED INTO VAPOR!!!
543388
Hmm, kinda hard to help you here, since we can't see all your options for the first two.  The ellipses (. . .) indicate that you have more in your message than is being displayed.  Perhaps if you retyped them, it would be easier for us to help.\n\nHere's what I *can* help with:\n\nHalogens:Reactive as Noble Gas:STABLE\n(the halogens are very reactive gases, while the noble gases are extremely stable, almost to the point of being inert)\n\nOxygen:molecule as chloride:ION\nOxygen gas is a molecule, while chloride is the ionic form of chlorine\n\nRatio:subscript as oxidation number:CHARGE\nthe ratio of components in a mixture is denoted by the subscripts, as the oxidation number of an atom is denoted by its ionic charge
950673
no boron as with berylium among others is an exception to the octet rule. when bonding, the boron need only to share 3 bonds with (an)other element/s translating to 6 electrons for it to become stable... an example of a compound following this setup is triflouride (BF3)\n\ni hope that helps...