With the upcoming presidential election, Ira decided to create a survey to find out who might win. He carefully created a vali
survey and gave it to five of his closest friends. He then tallied the results from the surveys and published his data in the sche
newspaper. Which of these would be a reason why Ira's results are not valid?
A)
The survey was not good enough
B)
The sample size of five was too small.
C)
There is not problem; the results are valid
D)
He only published his data in a school newspaper.

B)

The sample size of five was too small.

Explanation:

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

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b