1. Parts of Atoms: Page 21 QUESTION: What’s the difference between the parts of an atom? OBJECTIVE: SWBAT name the 3 parts of an atom and describe their differences. VOCABULARY: protonsAMUneutrons electronsatomic number atomic mass

2. Parts of Atoms 21 Write these questions onto page SKIP ONE LINE BETWEEN EACH QUESTION 1.What’s the differences between the three parts of an atom?

3. Although atoms are the smallest pieces of elements, even they are made up of parts. Atoms The center of the atom is called the nucleus. The nucleus has a positive electrical charge. The nucleus is surrounded by the electron cloud. The electron cloud has a negative electrical charge.

4. Atoms have three basic parts.three basic parts Parts of the Atom Protons Neutrons Electrons

5. The nucleus of an atom is made up of two parts. The protons and the neutrons. The Nucleus

6. The proton is found in the nucleus and has a positive charge. It’s symbol is p +.proton The Proton The proton has a mass of one AMU.AMU

7. The neutron is found in the nucleus and has no charge. It’s symbol is n.neutron The Neutron The neutron has a mass of one AMU.

8. The electrons circle the nucleus in an area called the electron cloud. It’s symbol is e -.electrons The Electron The electron has a mass of. 0006 AMU.

9. Even though the electrons are spinning around the nucleus at about the speed of light, they continue to orbit the nucleus. Why Don’t the Electrons Spin Away Positive and negative electric charges attract one another like magnets.

10. Protons have one positive charge and electrons have one negative charge. Atoms always have the same number of protons and electrons. The charge on Atoms Just like positive and negative numbers cancel each other, so do electric charges. Atoms are neutral, they have no charge. +16 -16 0

11. Each element is given its own number. This is called the atomic number. It is the number of protons in the nucleus of the atom. atomic number Atomic Number and Atomic Mass Atoms like all matter have mass. The mass of an atom is called the atomic mass or weight.atomic mass

12. COPY THE TABLE ONTO PAGE 21 Parts of the Atom Atomic Part Symbol Location Charge Mass (AMU) protonp + nucleus +1 1 neutronn nucleus none 1 electrone - electron -1.0006 cloud

13. Parts of Atoms: Review Parts of Atoms: Review page 21 Check that the answers to these questions are in your notes. 1.What’s the differences between the three parts of an atom?

14. VOCABULARY Proton-the positively charged part of the atom found in the nucleus. AMU-a unit for measuring the mass of an atom. Neutron- the part of the atom found in the nucleus having no charge. Electron-the negatively charged part of an atom found circling the nucleus. Atomic number-the number of protons in an atom. Atomic mass-the weight of an atom.