DO NOW 9/11/12: Draw the picture below and label each line with proton, electron, or nucleus. Get your homework out on your desk if you didn’t turn it in yesterday! 1. 2. 3.

1. Chemistry is everywhere in the world around us 1. Chemistry is everywhere in the world around us. Most matter exists as combinations of elements that are joined together chemically. The BIG ideas 3. Elements come together in specific and predictable ways to form the chemical compounds of the world. 2. In a chemical reaction, matter is not created or destroyed, only rearranged.

QUESTION OF THE DAY Why are products at Walmart sorted into groups in the store? Example: electronics, food, clothing.

Periodic Symbols The Periodic Table organizes elements by their number of protons.

Hydrogen Name of element 1 Atomic Number H Symbol 1.00794 Atomic Mass

The atomic number is the number of protons in one atom of an element. SCIENCE SCHOLAR CHECK: Where are protons found?

H SCIENCE SCHOLAR CHECK 1 1.00794 What is the atomic number for hydrogen? How many protons does Hydrogen have in its nucleus? Hydrogen 1 H 1.00794

A stable atom has the same number of protons as electrons. Look at this picture of a Lithium Atom!! How many protons does it have? How do you know? How many electrons?

SCIENCE SCHOLAR CHECK What is the name of this element? What is its chemical symbol? What is its atomic number? How many protons does it have? How many electrons?

Atomic Mass = number of protons + number of neutrons Atomic Mass is the mass of one atom of an element. Atomic Mass = number of protons + number of neutrons + + + + + + + + Why is it only protons and neutrons, not electrons? *** Because protons and neutrons are BIG and make up most of the mass of the atom. The electron is too small to add to the mass.

Neutrons = Atomic mass – Protons To find how many neutrons an atom has, take the atomic mass and subtract the number of protons. Neutrons = Atomic mass – Protons What is the Atomic Mass? What is the Atomic number? How many protons does Oxygen have? How many neutrons does Oxygen have?

Homework: Due at the beginning of class tomorrow!

This is to be done silently and independently. INDEPENDENT PRACTICE This is to be done silently and independently.

Use the periodic table to fill in the blank spots. Practice Set 1 7. 1. 13. 2. 8. 14. 3. 9. 15. 4. 10. 16. 5. 11. 17. 6. 12. 18.

Use the periodic table. Practice Set 2 1. 13. 7. 2. 8. 14. 3. 9. 15. 10. 16. 5. 11. 17. 6. 12. 18.

INDEPENDENT PRACTICE Worksheet This is to be done silently and independently.

CLOSING What is the periodic table? Answer the questions on the left. DID WE MEET OUR DAILY OBJECTIVE? Students will analyze symbols on the periodic table. What is the periodic table? Answer the questions on the left. Boron