Semester Test study guide Flashcards
Charge of an Electron
Negative
Charge of a Proton
Positive
Charge of a Neutron
Neutral / no charge
Positively charged particles made of protons and neutrons located at the center of an atom
Nucleus
Cloud around the nucleus that contains electrons
Electron cloud
States that electrons move in set orbits around the nucleus, like planets
Bohrs model
Between 1-8 and is found in the outermost shell of an atom
Valence electrons
an atom that has the same number of protons as other atoms but that has a different number of neutrons
Isotope
a substance that cannot be broken down into simpler substances by chemical means
Elements
a group of atoms that have gained or lost one or more electrons and has a positive or negative charge
Ion
Horizontal rows in the periodic table
Periods
Vertical rows in the periodic table
Groups
states that when elements are listed in order of number of protons, similarities in their properties occur in a regular pattern
Periodic law
the smallest unit of an element that maintains the properties of that element
atom
The arrangement of atoms in a substance
Chemical structure
The angle formed by two bonds of the same atom
Bond angle
The average distance between the nuclei of two bonded atoms
Bond length
Represents bond lengths and angles
ball and stick model
Only chemical symbols are used to represent the atoms
structural formula model
Shows the space occupied by atoms in a 3D space
Space-filling model
A substance made of atoms of two or more different elements that are chemically combined
Compound
How things are alike
Compare
How things are different
Contrast
A possible explanation or answer that can be tested
Hypothesis