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Atomic Theory, The Atom, and The Periodic Table

Name:  _________________________________

Date:_____________Pd:___________
Across
These elements are poor conductors of electricity and are not malleable or ductile
Positively charged particle in the nucleus
Discovered the neutron
The atomic mass rounded
Negatively charged particle found in the orbitals
The symbol for this transition metal is Au
The number of protons
The periodic table has 18 ___
This atom has a mass number of 9
Elements that are lustrous, typically greyish in color, are often magnetic, and are ductile and malleable
Scientist who stated that electrons move around the nucleus in defined orbitals
This group 14 element has 41 neutrons
Came up with the "plum pudding" model, discovered electrons using a cathoderay
Down
This is the symbol for Tin
Scientist who created the foundation for the modern periodic table
This alkali metal has 19 electrons
This transition metal has a mass number of 52
Neutrally charged particle found in the nucleus
The fission of this element was used in the creation of the atomic bomb. This element's atomic number is 92.
Center of the atom, location where protons and neutrons are found
Places where electrons are found
The law of definite proportions states that ___ always contain the same elements in exactly the same proportions by weight or mass
Ancient Greek scientist who first identified the possibility of the atom
Modern atomic model, uses principles of wave mechanics to explain where electrons are most likely found
The periodic table has 7 ___
Conducted the gold foil experiment, stated most of the mass of the atom was found in the nucleus
This element has 29 protons
This halogen has an atomic mass of 126.90
All matter is made up of
Scientist who discovered the Law of Definite Proportions