Atoms
The center of an Atom is called the what?
Nucleus
What is the charge of a neutron?
Uncharged/Neutral
What does the word 'atom' mean in Greek?
Indivisible
What does the 'M' in WHMIS mean?
Materials
The positively charged particle
A proton.
What charge does the nucleus have?
Positive
Who developed The Atomic Theory?
Dalton
What does the 'skull and cross bones' symbol mean?
Toxic
What is required for something to be called matter?
Mass and Volume
What two particles make up an atom's nucleus?
Proton and neutron.
Who developed the idea of energy shells or levels?
Bohr
In an atom, which subatomic particle has the least mass?
Electron
What is the smallest piece of matter that still has the properties of an element?
Atom
What did Rutherford discover?
Nucleus
What charge does an atom have?
Neutral/No charge
How does the mass of an electron compare to the mass of protons and neutrons?
Much, much smaller.
Who discovered the electron?
J.J. Thomson
What symbol would a tank of helium have on it?
Compressed Gas