Alice L. answered 06/07/21
Chemistry Major
Hi Anjela,
Groups are the columns while periods are the rows. The elements can be found by matching them along the periodic table. Some versions might use letters to label the groups while others might just use numbers.
#1: At, Astatine
#2: Ge, Germanium
#3: Ti, Titanium
#4: Na, Sodium
I hope this helps!