Vocabulary chapter 1 atomic structure and the periodic table
Periodic table
A table showing a repeating pattern of properties of the elements
Neutron
An atomic particle that has no charge
Proton
An atomic particle that is postively charged
Isotope
An element that has the same number of protons but different number of neutrons in the nucleus
Period
Each horizontal row in the periodic table
Metals
Elements that conduct electricity and heat well, and have a shiny appearance
Metalloid
Elements that have properties of both metals and nonmetals
Ion
Formed when an atom loses or gains one or more electrons
Atomic mass
It's the average mass of the isotopes of atoms of an element
reactive
Term used indicates how likely the element is to undergo a chemicals change
Half life
The amount of time it takes for one half of the atoms in a particular sample to decay
Electrons
The atomic particle that is negatively charged and moves around the outside of the nucleus
Group
The elements In a column in the periodic table
Nonmetals
The elements on the right side of the periodic table that have properties opposite of those metals
Atomic number
The number of protons in an atoms nucleus, which serves to identify an atom
Nucleus
The part of an atom that contains protons and neutrons
Radioactive
The process by which atoms produce energy and produce particles
Atomic mass number
The sum of an atoms protons and neutrons
