Notes 4-1. Intro to Atoms. Let’s see how much you remember…. Chapter Preview Questions. 1. Groups of two or more atoms held together by chemical bonds are a. elements. b. molecules. c. particles. d. electrons. Chapter Preview Questions.
Intro to Atoms
How do you know?
Because if the mass number is 12,
12 - 6protons = 6neutrons
Organizing the Elements
The atomic number tells how many _________ are in an atom of the element.
What is the chemical symbol for lead?
How many protons does potassium have?
What group number is beryllium in?
What period does silver belong to?
* Decreases atomic # by 2, and mass # by 4
* Atomic # increases by 1, mass # remains the same
IsotopeType of DecayElement Formed