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What is an atom?

Makes up all matter.

What are the components of an atom?

Protons, neutrons, and electrons.

What makes an element unique?

Different number of protons.

What does the atomic number represent?

Number of protons in an atom.

How are elements organized on the Periodic Table?

By columns and shared properties.

Where is most of the mass of an atom located?

In the nucleus.

How do you determine the mass number?

Sum of protons and neutrons.

What does the shorthand notation for an atom include?

Chemical symbol, atomic number, and mass number.

What happens if an element has a different number of neutrons?

It becomes an isotope of that element.

Why does each color of light in an emission spectrum have specific energy?

Energy levels of electrons determine emitted light.

What is the significance of valence electrons?

They determine chemical bonding behavior.