Atoms, Elements, Periodic Table

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

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What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the Periodic Table?

Back

A tabular arrangement of elements organized by increasing atomic number, which shows periodic trends.

Front

What is atomic number?

Back

The number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is atomic mass?

Back

The weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

What does the group number in the Periodic Table indicate?

Back

The number of valence electrons in the outer shell of the elements in that group.

Front

What happens to the atomic mass as you move down a group in the Periodic Table?

Back

Generally increases due to the addition of more protons and neutrons.

Front

What is a Bohr Model?

Back

A diagram that represents an atom with electrons in defined orbits around the nucleus.

Front

What is a chemical symbol?

Back

A one or two-letter notation used to represent an element, e.g., H for Hydrogen.

Front

What is the significance of the Periodic Law?

Back

It states that the properties of elements are a periodic function of their atomic numbers.