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Gemiola [76]
3 years ago
10

Please help I will mark Brainly

Chemistry
1 answer:
r-ruslan [8.4K]3 years ago
3 0
The answer is b) 6. An element in group 6A has 6 valence electrons. 2 valence electrons are in s orbital and 4 valence electrons are in p orbital.
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The radioisotope phosphorus-32 is used in tracers for measuring phosphorus uptake by plants. The half-life of phosphorus-32 is 1
Harman [31]

Answer:

54 days

Explanation:

We have to use the formula;

0.693/t1/2 =2.303/t log Ao/A

Where;

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t= time taken for the activity to fall to 7.34% of its original value

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Note that;

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Substituting values;

0.693/14.3 = 2.303/t log Ao/0.0734Ao

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0.693/14.3 = 2.6/t

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3 years ago
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Answer:

Explanation:

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