The Periodic Table
This number tells us how many protons are in an atom. Therefore, it also tells us how many electrons are in an atom.
Atomic Number
The center of an atom is called _____.
Nucleus
An element that is usually hard, malleable or ductile, and a good conductor of heat and electricity.
Metal
This person came up with the atomic model using shells.
Bohr
When looking at formulas to determine electron configuration, n means this.
Energy Level
This number tells us the sum of protons or neutrons in an atom. Sometimes, it is a mathematical sum.
The nucleus is filled with _____ and _____.
Protons and Neutrons
An element that is usually soft, not malleable or ductile, and a poor conductor of heat and electricity.
Non-metal
This person shot particles at a piece of gold foil. He noted that the atoms were mostly empty space due to the fact that they generally went through the foil (therefore, his particles went through the gaps between the particles within the gold atoms).
Rutherford
What does this formula tell us: 2(n2)
How many electrons are placed in each energy level.
These are vertical columns which tell us how many electrons are in the outer shell of an atom.
Groups
Electrons
An element that has properties of both a metal and a non-metal.
This person discovered the neutron.
Chadwick
Beryllium has 4 protons, 4 electrons, and 5 neutrons. What is its atomic mass?
9
These are horizontal rows which tell us how many energy levels are in an atom.
Periods
The outermost energy level or shell is called this.
Valence Shell
Elements on the far left side of the periodic table are _____ (reactive/not reactive).
Reactive
This person came up with the periodic table in a dream.
Mendeleev
Lithium-6 accounts for 7.59% of all naturally occurring lithium atoms. Lithium-7 accounts for 92.41% of lithium atoms. What is the atomic weight of lithium?
(6 x 0.0759) + (7 x 0.9241) = 6.924 amu
Mendeleev organized his table by ______, as we had not discovered subatomic particles yet.
Atomic Mass
An atom with more or less neutrons than protons is called this.
Isotope
Elements on the far right side of the periodic table are called ______, and they are (reactive/not reactive).
Noble Gases; not reactive
This person was the first person to believe matter was made up of atoms. Nobody believed him for 2400 years.
Democritus
If we were to imagine a very large atom with twelve energy levels, or shells, how many electrons would the twelfth shell hold if it were full?
2(122) = 288 electrons