C1 - Atomic Structure and the Periodic Table

• Elements with similar properties are found in the same group.
• The periodic table is organised into groups (columns) and periods (rows).
• The periodic table is organized by atomic number, which determines an element's position on the table.
• Compounds have different chemical properties than elements due to changes in electron arrangement.
• Atoms can gain or lose electrons to form ions.
• Metals tend to lose electrons to become positive ions, while non-metals tend to gain electrons to become negative ions.
• Ions attract other oppositely charged ions through electrostatic attraction.
• Molecules are made up of two or more atoms chemically bonded together.