Chemistry 112 (Vocab) - chp 4 Flashcards
Atoms with the same number of protons but different number of neutrons
Isotopes
Subatomic particles with no charge
Neutrons
The smallest particle of an element that retains its identity in a chemical reaction
Atom
negatively charged subatomic particles
Electrons
the number of protons in the nucleus of an element
Atomic number
defined as 1/2 the mass of a
carbon - 12 atom.
Atomic mass unit
centeral core of an atom, that contains most of atoms mass.
Nucleus
An arrangement of elements according to similarities in their properties
Periodic table
Positively charged subatomic particles
Protons
Average weight mass of the atom is in the element
Atomic mass
A glowing beam that travered from the cathode to the anode.
Cathode rays
all elements composed have atoms
atoms of same erement are identical
atoms of one element are different from those of another element atoms with different evements can physically
mix together or chemically combine in simple - whole # ratios for compounds
Chemical reactions occur when atoms are seperated, joined or rearranged
Daltons atomic theory
Total number of protons and neutrons in an atom
Mass number
Horizontal row on the periodic table
Period
He believed that atoms were indivisible and indestructible
Democritus
