The Atom
Name the three particles that make up an atom.
Proton, Neutron, Electron
The atomic number is how many ____ in that element's atom
Protons
Releases thermal energy
This bond is formed when there is an unequal sharing of electrons
Ionic Bond
Why are Group 18, the Noble Gases, unreactive
They have a full outer shell
or
They are stable with 8 electrons
This subatomic particle carries a positive charge
Proton
The shortened name for an element is call the _____
(Example: Hg)
Chemical Symbol
Absorbs thermal energy
Endothermic
This type of bond is formed when elements share at least a pair of electrons
Covalent Bond
An element has a total of 9 electrons, how many would be in the outer shell?
7
This subatomic particle carries a negative charge
Electron
The columns on the periodic table are called what?
Groups
What do we call the chemicals on the left of the arrow in a chemical equation?
? -> Product
Reactants
This group most often forms ionic bonds
Metals
An atom has an average atomic mass of 45 and has 20 protons, how many neutrons does it have?
25
What do we call the outermost layer of an atom's electron shells?
Valence Level
The rows of the periodic table are called what?
Periods
Name one sign that a chemical change has occurred
Makes a smell
Color Change
Precipitates
Bubbles
Etc.
This groups most often forms covalent bonds
Nonmetals
Who created the model of the atom that has the nucleus at the center and the electrons orbiting around it like planets?
Bohr
The number of protons in an atom is equal to the number of _____________
Electrons
For groups 1, 2 and 13 - 18 on the periodic table, what does the group number tell us?
The number of valence electrons
Why does heat tend to speed up a reaction
The thermal energy increases the motion and kinetic energy of the particles causing them to collide more.
Which electrons are used during bonding?
Valence electrons
What do you call an atom that loses or gains an electron?
Ion