Ch 10 Physical Science
Terms
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- groups
- vertical columns in the periodic table
- electrons
- negatively charged particles
- dot diagram
- uses the symbol of the element and dots to represent the electrons in the outer energy level.
- chemical symbol
- an abbreviated way to write the name of an element.
- valence electron
- located in teh outer energy level
- nucleus
- a positively charged center
- mass number
- the sum of the number of protons and the number of neutrons in the nucleus of an atom.
- atomic number
- number of protons in a nucleus
- nonmetals
- elements to the right of the stairstep line on the perioidic table. most do not conduct heat and electricity well.
- neutrons
- no charged particles
- isotopes
- Atoms of the same element that have different numbers of neutrons
- protons
- positivly charged particles
- periodic table
- arrangement of elements
- quark
- smaller particles of protons and neutrons
- metals
- shiny and good cnductors of heat and electricity
- electron cloud
- the region where electrons move about
- average atomic mass
- the average mass of the mixture of tis isotopes
- periods
- the horizontal rows of elements in the periodic table
- metalloids
- have properties of both metals and non metals.