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Alinara [238K]
3 years ago
8

What percentage of radium 288 is left after 1600 years ? ( figure out the number of half-lives,then look at the chart above to f

igure out the % remaining)
Chemistry
1 answer:
erastovalidia [21]3 years ago
5 0

Answer:

Find it ur self lol

Explanation:

lol just look it up

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How many valence electrons should be used to draw a Lewis structure of methane CH4
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Answer:

8 valence electrons

Explanation:

There are 4 valence electrons in carbon because it is in group 4A of the periodic table. There is 1 valence electron per hydrogen based on its position on the periodic table, but CH4 has 4 hydrogens in it. So 1 times 4 is 4. Add the 4 valence electrons from carbon with the 4 electrons from H4 to get 8.

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The answer is 14.8 hoped this helped
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Similarities between pluton and pegmatite
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