Which element has exactly five electrons in the highest principal energy level (the outer shell)? (a) se (b) ba (c) p (d) ge?

I have no clue what "p" is but none of them have 5 electrons in the outer shell

is has three carbons, so the answer is propylamine.

meth-

eth-

prop-

but-

pent-

hex-

hept-

oct-

non-

explanation:

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l