1. Classifying Matter Science 7—Chapter 10—Lesson 1 Lecture Notes May 12, 2015

2. Understanding Matter 0 Matter is anything that has mass and takes up space 0 Everything is matter. {Exceptions—light, magnetism} 0 An atom is a small particle that is a building block of matter

3. Atoms 0 Atoms have 3 parts protons neutrons electrons o At the center of an atom is a nucleus. The nucleus has a positive charge. o Protons have a positive charge and are found in the nucleus.

4. Atoms o Neutrons have no charge (neutral) charge and are found in the nucleus. o Electrons have a negative charge and are found in the electron cloud o An atom is almost too small to imagine.

5. Atomic Structure There are two basic components in every atom: Electron Cloud Nucleus

6. Subatomic Particles Electron Cloud: Electrons orbit the nucleus. Nucleus or “Core”: Protons and Neutrons are found in the nucleus.

7. Subatomic Particles Three subatomic particles make up every atom: Subatomic ParticleChargeLocation ProtonPositive (+)Nucleus or “Core” NeutronNo Charge (0)Nucleus or “Core” ElectronNegative (-)Electron Cloud

8. Atoms 0 Matter is anything that takes up space and has mass. All matter is made of atoms. 0 Atoms are the basic building blocks of matter. They make up everything around us; Your desk, the board, your body, everything is made of atoms! 0 Atoms are too small to see without powerful microscopes.

9. Substances o A substance is matter with a composition that is always the same. o This means that a given substance is always made of the same combination(s) of atoms.

10. Elements o An element is a substance that consists of just one type of atom o atomic number--the number of protons in an atom o atomic mass--the number of protons and neutrons in an atom (Round atomic mass to nearest one.)

11. Elements o Protons = Atomic Number o For an atom to be neutral, number of protons = number of electrons o Neutrons = Atomic Mass (Rounded to nearest 1) – Atomic Number o Symbol stands for the element. One capital letter or one capital letter and lower case letter.

12. Elements o The most basic unit of matter is the element!

13. http://www.brainpop.com/science/matterandchemistry/atom icmodel/