Junior Secondary · 8-9 · Science
What is the smallest unit of an element that retains its chemical properties?
An atom
What do we call a substance made of only one type of atom, that cannot be broken down into simpler substances?
An element
What organizes elements by increasing atomic number and groups elements with similar properties?
The periodic table
What do we call the number of protons in an atom's nucleus?
The atomic number
Name one element that is a gas at room temperature.
Oxygen, hydrogen, nitrogen, or helium (any one)
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