Chlorine-35 and 37 both have the same number of protons. Chlorine-37 has two more neutrons.
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When the little fish die they sink to the bottom, and after time the skeletons build up on top of each other.
Answer: 
Explanation:
25.3% Mg
74.7% Cl
First step: change % to g
25.3g Mg
74.7g Cl
Second step: calculate g/mol of each compound. You can do this by using the atomic mass.


Third step: determine the lowest number and divide everything by it. Of the result, extract whole number only.


Fourth step: Write each compound with their respective number below.
This empirical formula should be: 