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19 Nov 2019
What is the name of the element that is in group 6B and period 4? What is the name of the element that is in group 5A and period 6? What is the name of the element that is in group 2B and period 4? What is the name of the element that is in group 2A and period 3?
What is the name of the element that is in group 6B and period 4? What is the name of the element that is in group 5A and period 6? What is the name of the element that is in group 2B and period 4? What is the name of the element that is in group 2A and period 3?
Lelia LubowitzLv2
8 Apr 2019