(a) True or false: An element’s number of valence electrons is the same as its atomic number.

(b) How many valence electrons does a nitrogen atom possess?

(c) An atom has the electron configuration 1s 2 2s 2 2p6 3s 2 3p2 . How many valence electrons does the atom have?

Expert Solution

(a) False. Because atomic number indicates all the electrons of an element but valence electrons represent only electrons in the outer most shell only.

(b)

N (Z = 7) E.C is 1s2 / 2s2 2p3

second shell is valence shell and it has 5 electrons. SO, number of valence electrons in N = 5

(c)

There are 4 valence electrons. Because 3rd orbit is the lastorbit.

queen_honey_blossom answered 2 years ago

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