Which two electromagnetic waves are useful for diagnosing illnesses?

x-rays and radio waves
microwaves and gamma rays
gamma rays and x-rays
radio waves and ultraviolet waves

x-rays and radio waves i believe is the correct answer.

58 km per hour : d

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6