Science Test Flashcards
Proton
+, 1 amu, in the nucleus.
Neutron
Neutral, 1 amu, in the nucleus.
Electron
—, ~0 amu, outside the nucleus.
What happens if the proton number of an atom changes?
You get a different element.
What happens if the neutron number of an element changes?
You get a different isotope. (Like, chlorine-12)
What happens if the electron number of an atom changes?
The atom becomes an ion. (N^2+)
How many periods are in the periodic table? (Top to bottom)
7
How many groups are on the periodic table? (Right to left)
18
What are valence electrons?
Electrons on the outside shell.
How many valence electrons complete a shell?
2 or 8.
The period number tells you how many ____________ there are.
Energy levels.
What happened in Rutherford’s gold foil experiment?
He shot positive particles at Gold Foil. Most passed through, some bounced off. Discovered empty space in the atom and the positive nucleus.
