The Greek Philosopher that believed that the universe was made of empty tiny bits of stuff that he called atomos
Who is Democritus?
100
This is equal to the number of protons and electrons an element has
What is the atomic number?
100
This part of the atom is located in the nucleus and have a positive charge.
What are protons?
100
Elements on the periodic table are arranged in order of increasing atomic _____________
What is mass?
100
The smallest unit or part of an element
What is an atom?
200
The British Chemist that believed that all substances are made of atoms (these atoms are small particles that can not be divided, created, or destroyed)
Who is John Dalton?
200
There are 7 of these; elements in the same ________ have the same number of shells
What is periods?
200
This part of the atom located in the nucleus has no electrical charge.
What are neutrons?
200
This element is in a group of its own
What is Hydrogen?
200
The most abundant atom/element in the universe
What is hydrogen?
300
The British Scientist that believed that there are small particles inside the atom.
Who is J.J. Thomson?
300
There are a total of 18 of these; elements in the same ___________ have the same number of valence electrons
What is groups or families?
300
This part of the atom moves outside the nucleus and has a negative charge
What are electrons?
300
This element has 26 protons
What is iron (Fe)?
300
The name for two or more atoms bonded together
What is a molecule?
400
The Danish Scientist that believed that electrons move around the nucleus in paths or energy levels.
Who is Niels Bohr?
400
The name of the Russian chemist that arranged the elements
What is Dmitri Mendeleev?
400
The name for an atom that carries an electrical charge
What is an ion?
400
This element has an atomic mass of 19
What is fluorine (F)?
400
The number of electrons that the second shell can hold
What is 8?
500
Erwin Schrodinger and Werner Heisenberg believed that electrons do not travel in specific paths but they travel in _________________ (a region around the nucleus where electrons are found)
What are electron clouds?
500
The number of electrons the third shell can hold
What is 18?
500
The type of force that keeps the nucleus together
What is strong force?
500
The name for the group or family that contains elements 57-70
What are Lanthanides?
500
This is created from 2 atoms of hydrogen and 1 atom of oyxgen