Unit #1 Atomic Structure Vocab

atomos greek word for atom- means not able to be divided Democritis Discovered “small indivisible particles” that he named atoms. Atom the smallest component of an element having the chemical properties of the element Dalton’s Atomic Theory 1) elements are composed of atoms. 2) atoms of same element are identical, Read more…

chem ch 3: atomic structure

William Roentgen (1895) discovered we could use x-rays Henri Baquerel (1896) uranium salts exposed photography plates even when no light was present Marie and Pierre Curie they said nuclear reaction was taking place in uranium atoms named the spontaneous emission of radiation by an unstable nucleus “radioactivity” JJ Thompson (~1900) Read more…

Ch. 10 Nuclear Physics

ATOMIC MASS the mass of an atom expressed in atomic mass units TRANSMUTATION (physics) the change of one chemical element into another (as by nuclear decay or radioactive bombardment) ALPHA PARTICLE a positively charged particle emitted from certain radioactive nuclei; it consists of two protons and two neutrons and is Read more…

Atomic Structure and Periodicity

Atom the smallest particle of an element that retains its identity Element simplest form of matter that has a unique set up of properties What was Daltons experiment The sizes of the particles making up different gases must be different, Dalton realized that different particle sizes mean different structures What Read more…

Chemistry 1.1 – Atomic Structure

Define “Isotope” An atom of an element with the same atomic number but a different mass number, indicating a different number of neutrons Define “Atomic number” Number of protons within an atom Define “Mass number” The total number of protons and neutrons in an atom Define “Compound” Two or more Read more…

Atomic Structure and Theory

is a positively charged subatomic particle that is found in the nucleus of an atom proton is a negatively charged subatomic particle that is found in the space outside the nucleus electron is a neutral subatomic particle that is found in the nucleus of an atom. neutron equals the number Read more…

Atomic Structure and Theory

Democritus made a mental model of the atom; Greek philosopher Dalton formed the atomic theory model of the atom; English schoolteacher Thomas “plum pudding” model of the atom; discovered the electron Chadwick Discovered the neutron Rutherford Discovered the necleues using his gold foil experiament Proton the positive particle in the Read more…

Atomic Physics – Physics 30

First Hand Rule thumb – direction of charge flow fingers – curl in direction of magnetic field Second Hand Rule thumb – points towards magnetic north pole fingers – coil in direction of current Third Hand Rule thumb – direction of charge flow extended fingers – point towards SOUTH magnetic Read more…

Physical Science ch 10 (Nuclear Physics)

Protons Each element has a definite number of_________ Atomic number Number of protons equals________ Isotope Element with a different number of neutron__________ Protons and neutrons Adding _______ and __________ equals the atomic mass Nucleons Protons and neutrons are both called_________ The proton number determines the element Why cant the proton Read more…

Atomic Structure & Chemistry

periodic table A table that shows the elements, their atomic number, symbol, and average atomic mass; elements with similar chemical properties are grouped together. Dmitri Mendeleev created 1st periodic table element A pure substance made of only one kind of atom; every element on the chart has a neutral charge. Read more…

Topic 12 – Quantum & Nuclear Physics

Photon A particle of electromagnetic radiation with no mass that carries a quantum of energy Photoelectric Effect The emission of electrons from a metal caused by light striking the metal Wave-Particle Duality principle that states that both wave and particle concepts must be retained, because wave-like properties are exhibited in Read more…