Question

chemistry semester 1 exam on level 25-26
the periods and groups on the periodic table are numbered.
for example, the element neon is in the group 18.
which of the following elements is likely to have properties that are similar to those of neon?
krypton (kr), group 18
boron (b), group 13
iron (fe), group 8
lithium (li), group 1

Explanation:

Elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons. Neon is in group 18. Krypton (Kr) is also in group 18, so it will have similar properties to neon. Boron (B) is in group 13, iron (Fe) in group 8, and lithium (Li) in group 1, so their properties differ from neon's.

Answer:

A. krypton (Kr), group 18