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First element on the periodic table

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Reference no: EM131069250

1) What is the first element on the periodic table?

2) What is the centre of an atom called?

3) True or false? Acids have a pH level below 7.

4) What is the main gas found in the air we breathe?

5) True or false? An electron carries a positive charge.

Reference no: EM131069250

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