ECM: periodic table

Question 1

what group does hydrogen belong to?

Answer 1

hydrogen does not belong to any group

Question 2

name group 1, 2, 3-12, 17 and 18

Answer 2

group 1: alkali metals
group 2: alkaline earth metals
group 3-12: transition metals
group 17: halogens
group 18: noble gases

Question 3

elements with similar _______ are arranged in the same group

Answer 3

chemical properties

Question 4

properties of elements are different across the period. they gradually change from properties of _______ to ________

Answer 4

metals to non-metals