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Elden [556K]
3 years ago
14

If five elements have atomic numbers 2,3,6,9 which two numbers are the most reactive??​

Chemistry
1 answer:
meriva3 years ago
8 0

Explanation:

element \: with \: 2 \: atomic \: number \\  \\ is \: stable \: because \: it \: has \: already \:  \\  \\ completed \: its \: orbit \:  \\  \\ but \: atomic \: number \: with \: 3 \: and \: 9 \\ \\  will \: have \: to \: become \: stable \: \\  \\  after \: giving \:  one \: electron \\  \\ so \:  \: element \: with \: 3 \: and \: 9 \: atomic \: number \\  \\ is \: most \: reactive

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A particular radioactive nuclide has a half-life of 1000 years. What percentage of an initial population of this nuclide has dec
Delicious77 [7]

Answer:

91.16% has decayed & 8.84% remains

Explanation:

A = A₀e⁻ᵏᵗ => ln(A/A₀) = ln(e⁻ᵏᵗ) => lnA - lnA₀ = -kt => lnA = lnA₀ - kt

Rate Constant (k) = 0.693/half-life = 0.693/10³yrs = 6.93 x 10ˉ⁴yrsˉ¹

Time (t) = 1000yrs  

A = fraction of nuclide remaining after 1000yrs

A₀ = original amount of nuclide = 1.00 (= 100%)  

lnA = lnA₀ - kt

lnA = ln(1) – (6.93 x 10ˉ⁴yrsˉ¹)(3500yrs) = -2.426

A = eˉ²∙⁴²⁶ = 0.0884 = fraction of nuclide remaining after 3500 years

Amount of nuclide decayed = 1 – 0.0884 = 0.9116 or 91.16% has decayed.

3 0
3 years ago
What is the temperature of 1.485 moles of N₂ gas at a pressure of 1.072 atm and a volume of 20 L?
morpeh [17]

Answer:

178.67K

Explanation:

PV=nRT

T=PV/nR

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=178.67K

8 0
4 years ago
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