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Atomic Theory
Periodic Table
Elements & Isotopes
Definitions
Random
100
Who found the electron and what was his model called?
Thomson and the raisin bun
100
What are the 3 classes of elements you will find on the periodic table?
Metals, non-metals, metalloids
100
Find the atomic number, atomic mass, # of protons, # of neutrons and # of electrons for silver
47; 108; 47; 61; 47
100
Define homogenous mixture
Different components are not visible
100
What are the two subclasses of matter?
Pure substances and mixtures
200
What type of experiment did Rutherford use to find that a nucleus exists?
The gold foil experiment with a stream of positive particles
200
How many periods are there on the periodic table?
7
200
Find the atomic number, atomic mass, # of protons, # of neutrons and # of electrons for arsenic
33; 75; 33; 42; 33
200
Define matter?
Anything that has mass and occupies space
200
Give an example of a heterogenous mixture
Chocolate chip cookie
300
Who discovered energy levels and describe what they are?
Neils Bohr found energy levels. An energy level is a specific allowed energy for electrons.
300
What is a group when you refer to the periodic table?
The vertical columns. These are elements that share similar properties.
300
Find the atomic number, atomic mass, # of protons, # of neutrons and # of electrons for polonium-212
84; 212; 84; 128; 84
300
What is atomic number?
The number of protons in an atom of an element
300
Give an example of an element and compound
Element- anything from the periodic table (gold, nickel) Compound- sodium chloride, magnesium chloride
400
What was the problem with Rutherford's model?
It did not accurately explain why the electrons orbiting the nucleus were able to maintain their orbits. People wondered why the electrons did not crash into the nucleus.
400
What are some properties of metals?
Shiny, solids, conductors, malleable, ductile
400
Find the atomic number, atomic mass, # of protons, # of neutrons and # of electrons for copper-64
29; 64; 29; 35; 29
400
What is an isotope?
Isotope is an atom with the same element that differ in mass. The difference in mass is due to a different number in neutrons
400
How would you find the number of neutrons if you have the atomic mass and a periodic table?
Atomic mass= protons + neutrons Neutrons = atomic mass - protons
500
Name two of the points Dalton highlighted in his theory?
•Elements are made of extremely small particles called atoms. •Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties. •Atoms cannot be subdivided, created, or destroyed. •Atoms of different elements combine in simple whole-number ratios to form chemical compounds. •In chemical reactions, atoms are combined, separated, or rearranged.
500
What are properties of non-metals?
Brittle, dull, solid/liquid/gas, poor conductors
500
Find the atomic number, atomic mass, # of protons, # of neutrons and # of electrons for carbon-14
6; 14; 6; 8; 6
500
Define subatomic particle and give an example
Particles that make up an atom. Examples are neutron, proton, electron
500
Where did I grow up?
South Africa