Chemistry
Calculating Atomic Mass
19.78% of 10^B - 10x.1978 = 1.978 80.22% of 11^B - 11x.8022 = 8.8242 +10.8022 amu
Cathode Ray
A glowing beam between charged electrodes
Cathode
An electrode with a negative charge
Anode
An electrode with a positive charge
AMU
Atomic Mass Unit , grams are inconviniently small and pain to work with
Ion
Charged particle from gain or loss of electron. Add p+ and e- for example 8p+ added by 10e- gives a -2 chagre. Anion negative. cation positive.
Subatomic particle that carries a negative charge
Electons
Bohr's Model
Electrons move in fixed in circular orbits around nucleus of an atoms. Niels Bohr.
Mass Number.AtomicNumber.Chemical symbol.
Element-Chemical Symbol
Atomic mass number of an element is always a whole number
False
Democritus
Greek philosopher that said all matter is made of tiny particles called "atomos" or atoms.
Metals
High electrical and heat conductivity. High Luster. Ductile. Malleable. Dorate Electrons. 1 to 4 veilenelectrons. Solid at room temp.
Neon-22Neon-20
Isotopes, one has two more neutrons.
Plum Pudding Model
J.J Thomsons model of an atom, in which he thought electrons were randomly distributed within a positively charged cloud
Nuclear Model
Model of the atom with a nucleus containing protons and neutrons and with electrons in the space outside the nucleus. Ernest Rutherford.
Neutron Charge
No charge
NonMetals
Nonluster. Poor conductors. Gases at room temperature. Brittle Solids. Accepst electrns. 5 to 8 veilen electrons.
Democritus were not useful in a scientific sense:
Not useful explaining chemical behavior. Lacked experimental support.
Proton .Neutron.Electron Locations
Nucleus.Nucleus.Orbitals.
Horizontal rows on period table
Periods
Metalloids
Properties are intermidiate. Semi conductor.
Elements are different because their atoms contain different number of...
Protons
Subatomic particle that carries a positie charge
Protons
Determining number of atomic particles
Protons = Electrons MassNumber-Protons = Neutrons Atomic Number = Protons Nuclear charge = + Protons Nucleons=Mass Number
Quantum Mechanical Model with Protons +Neutrons
Protons-Ernest Rutherford. Neutrons: James Chadwick.
Isotopes
Same number of protons different neutons. For example one proton and two neutons of Hydrogen would be 3^H with 1 at the bottom.
Periodic table atomic order repetition of chemical and physical properties
True
TorF? Alpha particle has a double positive charge because it is a helium atom that has lost two electrons?
True
Electron Symbol.Charge.Mass.ActMass.
e^-.1-.1/840.9.11x10^-28
Neutron Symbol.Charge.Mass.ActMass.
n^0.1.1.67x^10_24
Proton Symbol.Charge.Mass.ActMass.
p^+.1+.1.1.67x10^-24
Mass Number
protons+neutrons
Quantum Mechanical Model
the modern description, primarily mathematical, of the behavior of electrons in atoms. Erwin Schrodinger.
isotopes are chemically alike because
they have identical numbers of protons and electrons
Dalton's model of the atom
was a solid sphere of matter that was uniform throughout-John Dalton
