Select the correct answer.

An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?

A.

10

B. 20

C.

30

D. 0

E. 200

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Which word is correctly used in blank #2? I need to go _1__ the store and __2__ snacks. by buy

What are the names of the three end punctuation marks?

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