Answer:
I am pretty sure it's Lithium because it's a light and soft metal. Bromine is a liquid so that cant be it and Niobium is a light gray crystalline (crystal/ sharp not dull).
Hope this helps :)
Explanation:
Alpha helix and beta sheets are the secondary structure of protein
The net ionic equation of the reaction could be determined by cancelling out the like ions between both sides of the reaction. These ions are called spectator ions. They are called as such because they do not actively participate in the reaction. The spectator ions are Na+ and Cl-. When you cancel those, the equation would become letter D.
Answer:
i=1.62 .
Explanation:
Let, i be the Van't Hoff Factor.
Moles of benzamide,=
Molality of solution, m=
Now, we know
Depression in freezing point,
.....1
It is given that,

Putting all these values we get,

Now, moles of ammonium chloride=
molality =
Putting all these values in eqn 1.
We get,
i=1.62 .
Hence, this is the required solution.
Answer : The charge carried by a phosphide ion is, (-3)
Explanation :
In phosphide ion, the (-ide) indicates that the phosphide ion is the anion of phosphorous. So, we will have to add electrons.
As we know that the phosphorous belongs to group 5 and have 5 valence electrons.
The atomic number of phosphorous = 15
The electronic configuration of phosphorous is, 
In phosphorous, the 'p' sub-shell is half filled. For fully filled 'p' sub-shell, we will need '3' electrons. By adding 3 electrons in 'p' sub-shell of phosphorous, (-3) charge will be created on phosphorous and named as phosphide ion.
Phosphide ion is written as, 