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~Explanatión :-
7. Gaining three electrons
8. (Group 3 elements have 3 valence electrons) - Boron
9. The atom will become positively charged because it has lost an electron.
10. Sulphur.
Number of protons = Number of electrons
So, number of electrons is also 16. And 16th element in the periodic table is sulphur.
_____________________________
~State true or false :-
1. False (It has total of 8 valence electrons)
2. True
3. True
4. False (Maximum no. of electrons in L shell is 8)
5. True
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Question 1
What is the difference between valency and valence electrons?
-- Valency is the combining capacity of an atom, i.e how many electrons an atom can gain or loose. Valence electrons are the total number of electrons in the outermost shell of any atom.
Question 2
Write the electric configuration of first 20 elements and write the valency under it.
-- Refer to attachment
Question 3
Electronic configuration = 2,8,7
Atomic no. = 17
Element X = Chlorine
Valency = 8 - 7 = 1
Valency electrons = Electrons in outer shell = 7