Atomic Theory
Where did the name Atom come from?
The Greek word Atomos.
What is the Atomic number?
The number of Protons
Who discovered the Electron?
J.J Thomson
What element is O?
Oxygen
Atoms are huge True or False?
False
Who formed the Atomic Theory?
Dalton
Metals are ____ Conductors of heat and electricity.
Good
What was Thomson's model called?
The Plum Pudding Model.
What element is Pb?
Lead
Atoms make up all ____.
Matter
What does the Atomic Theory state?
Each element is composed of tiny indestructible particles called atoms.
Nonmetals are ____ Conductors of heat and electricity.
Poor
Who conducted the gold foil experiment?
Rutherford
What is the symbol of Gold?
Au
What do we call an atom with the same number of protons but a different number of neutrons?
Isotopes
What did Democritus do?
He was the first to theorize that matter was made of tiny indestructible particles.
Metalloids are also known as ____
Semiconductors
Where is the positive charge in an atom?
The Nucleus.
What is the symbol and atomic number of Iron?
Fe;26
Isotopes have the ____ chemical properties and _____ masses.
Same,Different
How was the existence of Atoms proven?
Scanning tunneling microscopes helped scientists see them.
What is the charge of group 8 (Nobel Gases)?
0 charge
What did Rutherford discover about the atom?
He discovered that the atom is mostly empty space with something in the middle.
How did Mendeleev order the elements?
He listed elements in order of increasing relative mass, similar properties recurred in a regular pattern.
To figure out atomic mass you multiply the elements isotopes with?
Its Abundance