Lesson 1
Origins of the Atom
Origins of the Atom
The smallest particle that can still be considered an element.
Atom
The rows on the periodic table are called
Which group of metals are the most reactive?
Alkali
Describe how most nonmetals look
Dull and brittle
Where the word "atom" comes from and what it means
Atomos meaning uncuttable
The columns on the periodic table are called
groups or families
Are metals good or poor conductors of heat and electricity?
Good
This element is the most reactive of ALL the elements
Fluorine
The first scientist to theorize about the atome
John Dalton
What group is Lithium in?
Alkali Metals or group 1
What property of metals tells if the metal can be pounded into a sheet?
Malleability
What group of elements have some metallic properties and some nonmetallic properties?
Metalloids
The scientist who used gold foil and realized the positive particles were all in a nucleus
Rutherford
What number on the periodic table tells how many protons and element has?
The Atomic Number
Which metal is a liquid at room temperature?
Mercury
Which group of nonmetals has a name that means "salt forming"?
Halogens
Mass Number
Why aren't atomic masses whole numbers?
They are averages of all the known isotopes of the element
What property of metals describes whether or not they will rust in the environment?
Oxidation or corrosion
What are semiconductors used in?
Electronics like computers and cell phones