On the periodic table these correspond to the number of energy levels atoms have
What is periods
100
In a neutral atom the number of electrons and protons are
What is equal
100
The equation to determine the number of electrons an energy level can hold
What is 2 n squared
100
Elements that border the zig-zag line on the periodic table
What is metalloids
200
Electrons in the outer most energy level/shell of an atom
What is Valence Electron
200
Particle(s) that moves around the nucleus
What is Electrons
200
What is the correct symbol for sodium
What is Na
200
The presence of the ____ ____ were hard to detect because only about one billionth of a percent of the proton collisions performed shows a presence of a ____ ____
What is sixth quark
200
The sum of the number of protons and the number of neutrons in the nucleus of an atom
What is Atomic mass (mass number)
300
The 18 columns on the periodic table are called
What is Groups
300
Specific columns on the periodic table are called
What is families
300
The number of protons in an atom is equal to the number called
What is atomic number
300
The noble gases are very stable their outer energy level (valence shell) is
What is full
300
Rows on the periodic table are called
What is periods
400
Metallic properites decrease as you move from ____ __ ____ on the periodic table
What is left to right
400
The atomic number of W is 74, the mass of one of its isotopes is 184; how many neutrons are in an atom of this isotope
What is 110
400
Most of the elements on the left side of the stair-step (zig-zag) line are in this state of matter
What is solid
400
The Greek philosopher who theorized the exixtence of atoms
What is Democritus
400
The unit of measure for atomic particles (protons and neutrons)
What is atomic mass unit (amu)
500
He proposed the organization of the periodic table according to atomic mass
What is Mendeleev
500
He proposed the organization of the periodic table according to atomic number
What is Mosely
500
The area within the electron cloud in which electrons are most likely to be found
What is orbitals
500
A method of writing an element symbol that also show the electron arrangement
What is Electron dot diagram (Lewis dot structure)
500
Scientist who created a model of the atom in which the electron s revolve around the nucleus at set distances