An element has 4 protons, 5 neutrons, and 5 electrons. Bell Work: An element has 4 protons, 5 neutrons, and 5 electrons. What’s the atomic mass number? How many valence electrons are there? Is it an ion or neutral atom?

Preparing for TCAP… SPI 0807.9.1 What do the following items have in common? Magnifying glass, Paper airplane, Cup of Soup SPI 0807.9.3 It takes a _________ change to create a compound. SPI 0807.9.9 The periodic table is arranged according to the elements’ ___________ number. Made of Atoms chemical atomic

I can… Tell the difference between the atomic number and mass number. Find the number of protons, neutrons, and electrons in an atom. Determine which elements will bond together based on their valence electrons. Identify the difference between an ion and an atom. Differentiate between positive and negative ions.

Let’s review… Which of the following is an ion?

Which of the following describes an ion of Lithium ? Lithium lost 2 electrons. Lithium gained 2 electrons. Lithium transferred its electrons to another. Lithium lost 2 protons. -2

Which of the following would form an ionic bond? Sodium and Oxygen Nitrogen and Oxygen Calcium and Fluorine Sodium and Fluorine

Covalent Bonds Today’s Goal… Understand the difference between an ionic bond and a covalent bond. Understand the interaction between nonmetals.

Chemical Bonds Ionic Bond Covalent Bond Electrons are transferred. Metals to Nonmetals. Valence e- = 8 Electrons are shared. Nonmetals to nonmetals. Strongest bonds.

Ionic or Covalent? Sodium and Chlorine Magnesium and Oxygen Carbon and Nitrogen Nitrogen and Oxygen Scandium and Nitrogen Phosphorus and Sulfur Iodine and Hydrogen Calcium and Oxygen Ionic Ionic Covalent Covalent Ionic Covalent Covalent Ionic

Lewis-Dot Structures Simple way to show how the valence electrons are arranged

Now you try… Helium Sodium Carbon Nitrogen Lithium Argon