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Tanya [424]
3 years ago
11

How does the number of valence electrons for elements change across a period?

Chemistry
2 answers:
kondor19780726 [428]3 years ago
8 0

Answer: Option (b) is the correct answer.

Explanation:

Valence electrons is the number of electrons present in the outermost shell of an atom.

So, when we move across a period from left to right then there will be increase in number of valence electrons.

For example, valence electrons in carbon is 4, nitrogen has 5 valence electrons, oxygen has 6 valence electrons.

Thus, we can conclude that number of valence electrons increases for elements change across a period.

NeTakaya3 years ago
4 0
D. The number increases and then decreases for noble gases
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Cindy made tea. She started with 300 grams of water at 20 degrees Celsius. She transferred 18,000 calories to the water. What wa
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Answer:

T final = 80°C

Explanation:

  • Q = mCpΔT

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∴ m H2O = 300 g

∴ Cp H2O (15°C) = 0.99795 cal/g.K ≅ 1 cal/g.K

∴ T1 = 20°C = 293 K

∴ T2 = ?

⇒ 18000 cal = (300 g)(1 cal/g.K)(T2 - 293 K)

⇒ (18000 cal)/(300 cal/K) = T2 - 293 K

⇒ T2 = 293 K + 60 K

⇒ T2 = 353 K (80°C)

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4 years ago
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Nonamiya [84]

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7 0
3 years ago
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