Atomic Theory and Bonding Flashcards
Valency
the no. of bonds an element or ion. can form
ion
charged particle formed by the losing or gaining of electrons
mass no. =
number of protons + neutrons
electrons have a mass of ____ and are _____ charged
almost 0, negatively
neutrons mass:___ charge:___
m=1 c=neutral
protons mass:__ charge: ___
m=1 c=+1
isotope
atoms with same atomic number, different mass numbers (same no. protons, different no. neutrons)
metal atoms ______ to form ______
lose electrons, positive ions
non-metal atoms ______ to form ______
gain electrons, negative ions
a bond between two non-metal elements is
covalent molecule OR carbon diamond, carbon graphite and silicon dioxide are covalent networks
properties of covalent molecule
low mp/bp, never conduct
properties of covalent network
high mp/bp, don’t conduct
what is a bond between a metal and a non-metal called, and what are its properties
ionic, high mp/bp, conduct when liquid or dissolved
what structure occurs in ionic bonding
ionic lattice
what is a bond between a metal and a metal called, and what are its properties
metallic, high mp/bp, conducts
why do ionic compounds not conduct when solid
ions are not free to move
why do ionic compounds have high mp
to melt an ionic compound millions of strong ionic bonds must be broken, this requires a lot of energy
covalent molecular substances have _______? (bonds)
strong covalent bonds within the molecule and weak bonds between molecules
