Daniel’s doctor is trying to determine the cause of his recent onset of asthma symptoms. of the information daniel provided, which would his doctor find most in determining a cause? a. daniel had never experienced asthma symptoms until now. b. daniel notices the asthma symptoms occurs more often during cross country practice. c. daniel’s worst symptom is shortness of breath. d. daniel’s sister was diagnosed with asthma at an early age.

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