How many core and valence electrons are in each of the followingatoms? Atom core

Question

How many core and valence electrons are in each of the followingatoms?

Atom core
electrons valence
electrons Na 1 2 Kr 3 4 Pb 5 6

No Marks. To determine what portion of the question youhave correct, check question score at the top of theassignment.
Use the following effective nuclear charges experienced by theoutermost electrons:

Element P Al Br Pb Zeff 4.89 4.07 9.03 12.39

to order the elements in the order of the energy of their outermost(valence) orbitals (enter the symbols for the elements): highest energy 1___________

2___________

3___________
lowest energy 4____________
Atom core
electrons valence
electrons Na 1 2 Kr 3 4 Pb 5 6

Explanation / Answer

Na = 11 So, core electrons = 10 valance electrons = 1 Kr = 36 Core electrons = 36 valance electrons = 0 Pb=82 So, corec electrons = 78 valance electrons = 4 we know effective nuclear charge is more then it is difficultto remove the eletrons from the outer most orbital . So , order is Pb > Br > P > Al

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