Chemistry, 20.11.2020 14:00 cleef6451

I NEED HELP Which of the following statements is true?

The number of electron shells in an atom is called the atomic number.
Boiling and melting points are chemical properties.
A molecule of oxygen can have atoms of carbon in it.
Elements are substances made of only one type of atom.

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I NEED HELP Which of the following statements is true?

The number of electron shells in...