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An atom of an element has the electronic structure 2,8,8,2. What is its atomic number?

20 2+8+8+2= 20
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Answered by Molly F. • Chemistry tutor
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What is a chain reaction?

When neutrons from one reaction fire off to cause further reactions.
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Answered by Molly F. • Physics tutor
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what type of microscope would you use to study living cells?

There are two main types of microscope: light microscopes are used to study living cells and for regular use when relatively low magnification and resolution is enough.
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Answered by Molly F. • Biology tutor
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Simplify (m-7)(m+3)/6(m+3)

Find the highest common factor between the brackets and then divide by this:in this case it is (m+3)so working out should look like this:(m-7)(m+3)/(m+3)/6(m+3)/(m+3)this will work out as:m-7/ 6
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Answered by Molly F. • Maths tutor
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Fred is reshaping his garden. He decides to make into a right-angled triangle ABC. The length AB= 5m and the length BC= 12 What is the length of AC?

This is a question based on the application of Pythagoras. In the question a diagram of the triangle ABC will be provided and we would be able to see that we would need to work out the hypotenuse. Thus using...
AB
Answered by Amy B. • Maths tutor
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