Chapter 3 Flashcards
Atom
Smallest particle that can be considered an element
Electron
Negatively charged particles
Nucleus
Positive charge must be packed within a small region in its center called the nucleus
Protons
Positively charged particles
Energy level
An electrons movement
Neutron
There is no electric charge
Atomic number
The number of protons in the nucleus of an atom is the atomic number
Isotopes
Numbers of neutrons
Mass number
The sum of protons and neutrons in an atom
Atomic number
The number of protons in the nucleus
Periodic table
An arrangement of elements showing the repeating pattern of their properties
Chemical symbol
Just below the atomic number is the letter k-the chemical symbol
Periods
The periodic table is arranged in rows called periods
Groups
The elements column in the periodic table
Metals
Elements that are good conductors of electric current and heat.
Luster
Shiny and reflective
Malleable
Can be hammered or rolled into flat sheets
Ductile
Material that can be pulled out or drawn into long wires
Thermal conductivity
The ability of an object to transfer heat
Electrical conductivity
The ability of an object to carry an electric current
Reactivity
How an element combines or reacts with other substances
Corrosion
The deterioration of a metal due to a chemical reaction
Alike metal
Most reactive elements in the periodic table
Alkaline earth metals
Harder and denser and melt at higher temperatures
