Four students obtained the following measurements for a ruler. The actual length was 30.5 cm. Each student measured the ruler 4 times. Which of the following statements regarding their measurements are correct?
Student
Ruler
Measurements
Student 1
31.5
31.4
31.5
31.4
Student 2
30.4
30.5
30.4
30.4
Student 3
30.02
30.25
30.18
30.07
Student 4
28.5
28.7
28.7
28.6
I. Student 1's measurements were precise, but not accurate,
II. Student 2's measurements were both accurate and precise.
III. Student 3's measurements were accurate, but not precise.
IV. Student 4's measurements were precise, but not accurate.
DI
11
III
V

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

2b2t

explanation:

2b2t

fe 55.85 g/mol and h2o 18.02 g/mol.