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Periodic table: Period 3 group 7

I am pretty sure I know the basics of reading a periodic table now.

Periods are rows and groups are columns.

The question asks me to decide what electron configuration the element in period 3 group 7 is likely to be. If I am not mistaken, no element exists in that location.

See attached:

IMG_9926.jpeg


I can assume they mean group 17 based on deduction. The answers all have p in their last configuration letter.
(edited 2 months ago)
Original post by KingRich
I am pretty sure I know the basics of reading a periodic table now.
Periods are rows and groups are columns.
The question asks me to decide what electron configuration the element in period 3 group 7 is likely to be. If I am not mistaken, no element exists in that location.
See attached:
IMG_9926.jpeg
I can assume they mean group 17 based on deduction. The answers all have p in their last configuration letter.
The modern iteration of the periodic table numbers the groups (columns) 1-18, whereas the previous iteration gave the numbers as 1a-8a (s and p blocks) and 3b - 8b, followed by 1b & 2b (transition metals).

Option C in the question is correct, as there are 7 s&p electrons.
(edited 2 months ago)
Reply 2
Ah right, so ignoring d orbital section. It would mean period 3: Na,Mg,Al,Si,P,S,Cl,Ar. Which would be chlorine. Thank you for explaining this. Again, this wasn’t explained in the paper.

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