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Rasek [7]
3 years ago
10

Guys I need help with 12 and 13 please help!! This packet is due tommorow and I have more 7 pages to do

Chemistry
1 answer:
irinina [24]3 years ago
3 0
12. F - Most of these elements are metals.

13. C - Ability to rust
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Explanation:

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The radioactive isotope 210/84 Po decays by alpha emission.
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The half-life of polonium-210, given that it decays from 98.3 micrograms to 12.3 micrograms in 414 days is 138 days

<h3>How to determine the number of half-lives </h3>
  • Original amount (N₀) = 98.3 micrograms
  • Amount remaining (N) = 12.3 micrograms
  • Number of half-lives (n) =?

2ⁿ = N₀ / N

2ⁿ = 98.3 / 12.3

2ⁿ = 8

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<h3>How to determine the half life </h3>
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t½ = t / n

t½ = 414 / 3

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