Answer the question below based on the periodic table entry for bromine. how many electrons are in the n = 2 orbit?
2
8
18
7

             8 Electrons

                    In statement the letter "n" specifies the Principle Quantum Number. Principle Quantum number is main energy level of an atom. Hence, n = 2 means we are talking about the second energy level or second shell of an atom.

                    Also, the number of electrons present in any main energy level are calculated by using following formula,

                                                         2n²

Hence, as,

                 n = 2

So, by putting this value in above formula,

                                                         2 (2)²

                                                         2 (4)

                                                         8

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.