Chemistry

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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


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