31
I think. Protons and electrons share the same number as well as the atomic number.
The answer is D. CaCl2 and H2O
1. inner core
2. outer core
3. mantle
4.crust
It is 4 because if you think about it it makes more sense
Answer:
Age of the ancient wood object is 11460 years.
Explanation:
We know that half-life for carbon-14 is 5730 years. That means the activity of the sample will decrease to half every 5730 years.
Now we construct the following table:
activity (counts/min) age of the wooden object
40 0
20 5730
10 11460
