People and Theories
Who was the first person to theorize about the Atom
Democritus
The center of an atom is known as the...?
Nucleus
What are the three subatomic particles?
Protons, electrons, and neutrons
What is the atomic number for Carbon?
6
What is the symbol for Silver?
Ag
Aristotle believed the world was made up of 4 major elements, what were they?
Earth, Air, Fire, and Water
Where are valence electrons located?
On the outermost energy level of an atom
What charge does a Electron have?
Negative
If Magnesium has 12 protons, how many electrons does it have?
12 electrons
Polonium
Who is the English physicist that resurrected the idea of the atom after 2,000 years?
John Dalton
Which two subatomic particles make up the majority of the mass of an atom?
Protons and Neutrons
Which subatomic particle has no charge?
A Neutron
What is the mass number for Gallium (Ga)?
70
How many elements are on the periodic table?
118
How many electrons can the first energy level of an atom have?
2
What makes an atom neutral?
An equal number of protons and electrons
The atomic number tells you the number of ______ in an element
Protons
John Dalton theorized that atoms are neither _______ nor ________ in chemical reactions
Created ; Destroyed
If Nitrogen has 7 total electrons, how many valence electrons does it have?
5 Valence Electrons
Adding the number of protons and neutrons in an atom gives us the...?
Atomic mass or Mass number
How many Neutrons does Tungsten have?
110 Neutrons
What did Democritus originally name the tiny particles he discovered?
Atomos