5th grade science - unit e · periodic table are called groups, or families. the horizontal rows of...
TRANSCRIPT
5th Grade Science - Unit E
Chapter 2: Atoms and Elements
Lesson 2: What Are Compounds?● Read pg. E46-47● What is the periodic table?
○ table of elements○ In order of increasing atomic number
■ Number of protons in nucleus ○ Grouped by similar properties
■ Metals■ Nonmetals■ Metalloids - has properties of metals AND nonmetals■ (Artificially Made)
Compounds● Read p.E48-E49● What is a compound?
○ a substance made of the atoms of two or more elements● What does a chemical formula show?
○ The elements and the number of atoms of each element in one molecule of a compound
○ Example:■ Table Salt = NaCl
● 1 sodium atom● 1 chlorine atom
● When atoms join to form compounds, they undergo a chemical change.