chemistry

• The periodic table is organised into groups (columns) and periods (rows).
• Groups contain elements with similar properties, while periods contain elements with different properties.
• Elements are arranged by increasing atomic number.
• Atomic radius decreases as we move down a group due to increased nuclear charge attracting electrons closer to the nucleus.
• Atomic radius decreases across a period due to the increase in nuclear charge attracting electrons closer to the nucleus.
• Metallic character increases down a group as there are more valence electrons available to be lost.
• Ionic bonding occurs when an atom loses or gains one or more electrons to form ions.