<span>The question is asking for the number of valence electron that are available fo bonding in bromine. Bromine belongs the group 7 of the periodic table, thus it has seven electrons in its outermost shell. At times, all these seven valence electrons can be involved in a chemical bonding in order to form an octet structure. Also, bromine can form a single covalent bond with other elements during chemical reactions. </span>
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The rate determining step would be the slow step. Thus, Step 2 which is bimolecular is the rate determining step. I believe the correct answer from the choices listed above is option C. The reasonable conclusion would be that it <span> is second order overall because step 2 is bimolecular. Hope this answers the question.</span>
non-metals are brittle.
but for brittle property, they need to be solid.
sulphur is solid at STP.
Argon(Ar) is a gas at STP, so it cannot be brittle.