subatomic particles
It is the lightest of the three with a negative charge.
What is an electron
He coined the word atom
Democritus
The elements are arranged on the periodic table in order of increasing...
What is atomic number
This group/family has the most reactive metals.
What are Alkali Metals
These can conduct electricity and heat
What are metals
It is found in the nucleus and has no charge
What is the neutron
In this model, scientists know the probability of find electrons around the nucleus.
The horizontal rows tell you this about the element.
What is the number of energy levels
This group/family has 2 valence electrons in its outer most energy level
What are Alkaline Earth Metals
These are brittle when in solid form
What are nonmetals
The atomic number is equal to the number of these
What are protons
He said the atom was an invisible, indestructible sphere
The abbreviation of the element is called this
What is the symbol
Copper is in this group.
What are Transitional metals
These are semi-conductors
What are metalloids
The mass number equals the sum of these
What are the protons and neutrons
He discovered the electron using the cathode ray tube.
J.J. Thomson
The vertical columns tell you what about the element
What is the number of valence electrons
This family/group has the most inactive elements
What are Noble gases
Most of these are gases at room temperature.
What are nonmetals.
When you change the number of these particles you get an isotope
What are neutrons
He proposed the planetary model, saying that electrons are in specific energy levels with specific energy values.
Who is Niehls Bohr
This number cannot be found on the periodic table
What is the mass number
The reason elements react with each other.
What is to become like Noble gases.
These hold valence electrons loosely.
What are metals.