Basically, they just allow us to see farther into space, therefore letting us see in closer detail what objects in space are made of, such as flaming balls of gas (stars).
Answer:
When Moseley arranged the elements in the periodic table by their number of protons rather than their atomic weights, the flaws in the periodic table that had been making scientists uncomfortable for decades simply disappeared.
Explanation:
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The moon phases maybe? Can I see the passage possibly?
240mL = 0,24L = 0,24 dm³
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C = n/V
n = 3,5 M × 0,24dm³
n = 0,84 mol NaOH
1 mole NaOH ---------- 40g
0,84 mol ----------------- X
X = 40×0,84
X = 33,6g NaOH
:)