After Shenya’s examination, you will need to use an ultrasonic cleaner for sanitization. Describe how you would proceed and what source you would use if you had questions about the cleaner you are using.

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How many neutrons does an element have if its atomic number is 40 and its mass number is 156?

30 a town is built on the banks of a small lake on the edge of a desert. after some time, the townspeople discover that water from the lake has become too polluted to use. describe one way that the lake may have been contaminated by the actions of the townspeople, and explain how the townspeople can remediate this problem.