C2

• Ions are made when electrons are transferred.
• Ions - Charged particles.
• Ions always have either a + or - to show positive or negative charge.
• Cations - Positive ion
• Anions - Negative ion
• Metal atoms always lose electrons to and always have positive charges.
• Non-metals always gain electrons and always have a negative charge.
• Group 1 elements form ions by losing one electron.
• Group 1 elements form a 1+ ion.
• Group 2 form ions by losing two electrons.
• Group 2 forms 2+ ions.
• Some group 6 elements form ions by gaining two electrons.
• Group 6 forms 2- elements.
• Group 7 elements form ions by gaining one electron.
• Group 7 forms 1- ions.
• Ionic bonding - A bond between a metal and a non-metal that share electrons.
• Metal atoms lose electrons to form a positively charged ion.
• Atomic number is the number of protons in a nucleus.