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Periodic Table

Increase your knowledge of terms involving the periodic table.

ALKALI METALS Highly reactive Soft and have low melting points and densities Almost never found in nature as a pure element Group 1 – Have 1 valence electron
ATOMIC MASS Average mass of all known isotopes of an element (atom) Measurement of the total number of particles in an atom's nucleus (Protons + Neutrons = Atomic Mass)
ATOMIC SYMBOL Symbol used to identify each element Uses 1 or 2 letters based on the element's name 1st letter is always capitalized 2nd letter is NOT "H" "BR"
Dmitri Mendeleev Russian scientist Famous for his invention of the periodic table A classification of the elements
FAMILY or GROUP Vertical columns of the Periodic Table (HINT: From top to bottom) Same number outer (valence) electrons Family members have similar chemical and physical properties BEWARE—Family 13-18 are written different i.e., Family 13 is written Family 3
HALOGENS Nonmetal Family Found in nature as gases Located on Periodic Table in Group 7 Combines directly with most metals to form salts – NaCl (Table Salt)
METALLOIDS Exhibit some of the same Properties of metals & nonmetals Located along the stair-step line that separates metals from non-metals on the Periodic Table Some metalloids are semi-conductors – i.e., silicon
METALS Group of elements on left side of the Periodic Table Generally hard and shiny Good conductors of heat & electricity Lose electrons when ionized
NOBLE GASES Located on Periodic Table in Group 8 Generally NOT reactive Have maximum (8) number of electrons possible in their outer (valence) shell (Exception Helium)
NONMETALS Opposite of metals Poor conductors of heat and electricity Gain/share valence electrons easily They gain electrons to fill their outermost energy level
PERIODIC TABLE OF ELEMENTS Table showing all known elements Based on their atomic number Arranged by Periods (rows) AND Groups (families)
PERIODS Horizontal rows of the Periodic Table (HINT: From left to right) Atomic number increases left to right Row number tells you how many energy levels the atom contains
IONIZATION The gain or loss of electrons
Created by: pj johnson