Page 218 - Science Course 1 (Book 1)

Mo6-L3: Key Concept Organizer

Directions: Use your textbook to respond to each statement.
1. All atoms have the same basic structure. The nucleus is the center region of the atom.

Describe the nucleus by identifying the particles that are inside of it, its overall charge, and its mass
compared to the mass of an atom.

2. Electrons are one of the components of atoms. They are found in a region of the atom
called the electron cloud.

Describe electrons by identifying their charge and their relative mass compared to the atom as a whole.

3. Elements are arranged in the periodic table in order of their atomic numbers.

Identify what can be learned about an atom of an element if its atomic number is known.

4. Although every atom of an element has the same number of protons, the atoms of
an element can vary in other ways.

Identify how atoms can vary and what these types of atoms are called.

5. Atoms of an element can gain or lose electrons. An atom that has gained or lost electrons is called an ion.

Describe how gaining an electron changes the overall charge on an atom.

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