Basic Atomic Structure Study Guide
AU197/79][What is the mass number?
197
AU197/79][Number of protons?
79
AU197/79][What is the atomic number?
79
The symbol of and the number of neutrons in an atom of Barium:
Ba,81.
JJ Thomson
confirmed existence of neutrons
Au=Periodic abb. 197/79][What element is this?
Gold
The symbol and number of protons in Lithium:
Li, 3.
Their respective charges are:
Positive, neutral, and negative.
The three particles of the atom are:
Protons, neutrons, and electrons.
The symbol of and the number of electrons in a neutral atom of Uranium:
U, 92.
The number of protons in one atom of an element determines the atom's ____, and the number of electrons determines the _____ of the element.
atomic number, charge.
Made up of different kinds of ____.
atoms
Matter is made of ____.
atoms
____ of the same ___ are the same.
atoms, element
The _______ of an element is the average mass of an element's naturally occurring atom, or isotopes, taking into account the ___ of each isotope.
average atomic weight, mass.
_______ consisted of atoms of different elements combined together
compounds
James Chadwick
developed the beginnings of the modern atomic theory in the 1800's
Have 0amu mass
electrons
Atoms of different ____ are different
elements
All ____ are composed of indivisible _____.
elements, particles
Ernest Rutherford
first suggested the presence of atoms and named them atomos
STM
gave scientists first image of individual atoms
Protons
heavier than electrons, in nucleus
Neutrons
heavier than electrons, in nucleus as well
Atomic Weight
how much an atom weighs
-Ions
if the atom gains an electron, it becomes negatively charged
+Ions
if the atom looses electrons, it becomes positively charged
The ______ of an element is the total number of protons and neutrons in the ____ of an atom.
mass number, nucleus .
Anything that has ______ and takes up space.
mass, space
Electrons
negative charge, orbit outside nucleus
The mass number is used to calculate the number of ____ in one atom of an element. In order to calculate the number of neutrons you must subtract the ____ from the ____.
neutrons, protons, mass number.
Atomic Mass
number equal to number of protons in the nucleus
Atomic Number
number of protons in a neutral atom
The atomic number tells you the number of ____ in one atom of an element. It also tells you the number of ____ in a neutral atom of that element. The atomic number gives the "identity" of an element as well as its location on the periodic table. No two different elements will have the ___ atomic number.
protons, electrons, same.
Have 1amu mass
protons, neutrons
Includes all things that can be ____, _____, _____, or _____.
seen, tasted, smelled, touched
Democritus
used cathode ray tube to discover electrons
