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This is from OCR Unit 1 specification (Chemistry A)
the question might give you an idea of which group it is.
group 8 have VERY high IE. the trend from G1 - 7 is that it rises.
If there is a great big drop from one to another it is a G8 to G1. (eg. Ne to Na)
from there just count. you could also use the subshell rules (like filled and half filled orbitals need more energy to ionise etc.)
hope this helps :)