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Ludmilka [50]
3 years ago
6

Please help me with this thank you !!

Chemistry
1 answer:
Sindrei [870]3 years ago
4 0
The answer is I think is c
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An elements atomic number tells you the number of
liq [111]
The number of protons in the nucleus of the atom, I believe.  c:
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How many milligrams of a 20mg sample of cesium-137 remain after 60 years
andrey2020 [161]
Cs -137 has a half life of about 30 years. If 60 years pass, there is two half lives passed so 1/2 * 1/2= 1/4. Take 1/4 and multiply it with the mass given:
(1/4)*20mg=5mg left
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3 years ago
Which energy resource causes the most safety concerns?.
Vlad [161]

Answer:

Based on safety and carbon emissions, fossil fuels are the dirtiest and most dangerous, while nuclear and modern renewable energy sources are vastly safer and cleaner.

4 0
2 years ago
HELP ME PLEASE LIKE FRRR
g100num [7]

Answer:

http://hyperphysics.phy-astr.gsu.edu/hbase/Biology/imgbio/treecycle.p ng

Explanation:

8 0
3 years ago
I NEED HELP ASAPPP!! I WILL GIVE YOU A GOOD RATING LOL
ruslelena [56]

Answer:

Yes N3- is correct ion notation. The N element is in the form N2 . Also it is a triple covalent bond and so this correct

3 0
3 years ago
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