Calculate Number of Period and group of sodium and chlorine.
Answers
Explanation:
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Answer:
Sodium: period number:3; group number:1
Chlorine: period number:3; group number:17
Explanation:
The period number of Sodium(Na)
Sodium atomic number= 11
Electronic configuration= 2,8,1 <-(distribution of electrons in 3 shells)
There are 3 shells so 3rd period....
Therefore, period number of Na(sodium)=3
The group number of sodium(Na)
Sodium atomic number= 11
Electronic configuration= 2,8,1 <-(The valence(last) shell has 1 electron)
There is one valence electron so sodium will be in group 1....
Therefore, group number of Na(sodium)= 1
The period number of Chlorine(Cl)
Chlorine atomic number= 17
Electronic configuration= 2,8,7 <-(distribution of electrons in 3 shells)
There are 3 shells so 3rd period....
Therefore, period number of Cl(chlorine)=3
The group number of Chlorine(Cl)
Chlorine atomic number= 11
Electronic configuration= 2,8,7 <-(The valence(last) shell has 7 electron)
There are 7 valence electrons so chlorine will be in group 17....
Therefore, group number of Chlorine(Cl)= 17
(Remember that while finding group number if you get the answer as 7 valence electrons you have to change it to 17th group. For. example: If you get 3 as the number of valence electron then group number of the given element will be 13 (13th group) -----only when you get number of valence electrons greater than 2 you have to do this)