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Tcecarenko [31]
3 years ago
9

Identify what the element is on the periodic table

Chemistry
1 answer:
Olin [163]3 years ago
6 0
<h2>That is a <u>Lithium</u> atom!</h2><h3 /><h3>There are THREE protons in that atom. Lithium's atomic number is THREE. If you want to know what isotope that is, look at the neutrons and electrons.</h3><h3 /><h3><em>Please let me know if I am wrong.</em></h3>
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a sample that has a half life of 45 years take ____ for the count rate to drop from 600 cpm to 150 cpm
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Answer:

90yrs

Explanation:

Half life is the time taken for half of an original radioactive material to decay by half.

For the sample;

    Half - life = 45yrs

  Original amount  = 600cpm

 

                 Start                                  Number of atoms    

                 0yrs                                                600cpm

                                   First half life

                 45yrs                                              300cpm

                                  Second half life

                 90yrs                                               150cpm

5 0
3 years ago
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Korolek [52]

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7 0
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8 0
3 years ago
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C I’m pretty sure. I hope this helps
3 0
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Answer:

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Explanation:

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