The smallest unit of matter in this list is ________.

The electrons in an atom are located in the ___________.

What element has 9 protons?

Which of the following is the chemical symbol for lead?

__________ is the smallest atom.

What element has 19 protons?

A certain atom has 18 protons, 18 electrons, and an atomic mass of 39.95. How many neutrons does it have?

A certain atom has 4 protons, 4 electrons, and 5 neutrons. Its atomic mass is ____.

Matter is anything that has _________ and takes up ________.

Which of the following is the chemical symbol for copper?

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