MONDAY 10/20 What is an atom? What are the 3 parts of atoms? Which part of an atom is positive? Which part of an atom is negative?

Today’s Planner: Atom Family

I can draw and label an atom. Today’s Goal: I can draw and label an atom.

Today’s Plan: Atomic Structure Periodic Table PRACTICE

The Nature of Matter

The Nature of Matter How big is an atom compared to the Universe? Video

ATOM The smallest component of an element made of a nucleus of protons and neutrons with electrons circling this nucleus. 

Proton – A positively charged particle in the nucleus of an atom Neutron – A non charged particle in the nucleus of an atom Electron – A negatively charged particle that moves around the nucleus of an atom

A substance made of atoms that are all the same. ELEMENT A substance made of atoms that are all the same. Examples: Helium, Hydrogen, Gold, Copper, Oxygen NONEXAMPLES: Water (made of Hydrogen and Oxygen), Salt (made of Chlorine and Sodium), Sugar (made of Carbon, Oxygen, and Hydrogen)

Elements are represented by one- or two- letter symbols. Pure substance, consists entirely of one type of atom. Elements are represented by one- or two- letter symbols.

READING THE PERIODIC TABLE Number of Protons 11 Na 22.99 Number of Electrons Atomic Number Symbol Number of Protons + Neutrons Atomic Mass

C 12.01 6 How many protons does carbon have? How many electrons does carbon have? 6 C 12.01

Cl 35.45 17 How many protons does chlorine have? How many electrons does chlorine have? 17 Cl 35.45

N 14.0 7 How many protons does nitrogen have? How many electrons does nitrogen have? 7 N 14.0

F 19.0 9 How many protons does fluorine have? How many electrons does fluorine have? 9 F 19.0

Cu 63.5 29 How many protons does copper have? How many electrons does copper have? 29 Cu 63.5

P 31.0 15 How many protons does phosphorus have? How many electrons does phosphorus have? 15 P 31.0

Drawing an Atom

Terms to know: Atomic Number: the number at the top of each element’s box. Represents the number of PROTONS that atom has. It is also the number of ELECTRONS that atom has.

Practice What is the atomic number for Carbon? What is the atomic number for Oxygen? What is the atomic number for Nitrogen? How many protons does Lithium have? How many protons does Phosphorus have?

Electron Energy Levels Electrons “orbit” and travel around the NUCLEUS (the protons and neutrons) Electrons orbit in levels: Level 1: Can hold 2 electrons Level 2: Can hold 8 electrons Level 3-ish: Can hold 8 electrons The electrons in the outermost layer are called “VALENCE” electrons.