This would be answer choice C. the rate constant changes over time
The answer would be non-polar covalent.
Bromine is a non-metal, making the bond covalent.
The bond is non-polar because there is no unequal sharing between electrons because both elements in the bond are the same; they have the sane electro negativities.
The electron configuration of sodium in excited state is 
Atomic number of sodium is 
i.e. it contains electrons.
The electron configuration of sodium in ground state is 
When sodium is in excited state the valance electron of 
subshell jumps to 
subshell on gaining energy.
The condition of sodium is very unstable and thus the outermost electron in subshell will release energy and return back to its original orbital (that is ).
This will release equal energy which it absorbed to jump to subshell producing yellow light.
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Two alkaline earth metals; Be and Mg exhibit a diagonal relationship. The pair of elements are Be-Al and Mg-Li is Be-Al and Mg-Li.
Six elements make up the majority of alkaline earth metals (Group 2): beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). Compared to the elements in Group 1, this group typically contains smooth, silver metals with a less metallic character. Heavy metals like Ca, Sr, Ba, and Ra are equally as reactive as Alkali Metals Group 1 despite sharing many characteristics with that group. All elements found in alkaline earth metals contain two electrons in their valence shells, giving them an oxidation state of +2. This makes it possible for metals to shed electrons with ease, allowing them to create compounds with more stable ionic connections.
Two alkaline earth metals; Be and Mg exhibit a diagonal relationship. The pair of elements are Be-Al and Mg-Li.
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The answer is b. hot spots
