Lesson 1: Atomic Theory
What is a positively charged particle called?
A proton
The Periodic Table
What element is found at group 1 and period 1?
Hydrogen
Are polar bonds shared equally or unequally?
unequally
Do acids or bases taste sour?
Acids
What particle has a negative charge?
electron
The GROUP numbers go across horizontally to help us find an element. What do we call the numbers that go vertically to help us find an element?
The period numbers
8
An ionic compound
Bases
What is the center of an atom called?
The nucleus
P, Zn, and H are all examples of what kinds of symbols?
Chemical Symbols
Substances that form when atoms from two or more elements band together are called what?
compounds
What kind of bond usually form from nonmetal atoms?
Covalent Bonds
What number is neutral on the pH scale?
7
What is the smallest particle that can still be considered an element?
An atom
What is the average mass of all the isotopes of an element called?
The Atomic Mass
What types of elements are malleable, magnetic, and good for electrical conductivity?
Metal types
What is a neutral group of atoms joined by covalent bonds called?
A molecule
What type of paper can be used to test acids and bases?
litmus paper
The number of protons in the nucleus of an atom is called what?
The Atomic Number
How many known elements are there?
118
What types of elements have some properties of metals and some properties of nonmetals?
metalloids
An ion
The reaction between an acid and based is called what?
A neutralization reaction