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Atoms
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3 subatomic particles; proton(+1), neutron(0) and electron(-1)
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terms list
Atoms
3 subatomic particles; proton(+1), neutron(0) and electron(-1)
proton number
the number of protons in its atom
nucleon number
total number of proton and neutrons in an atom
electronic configuration
first shell 2 electrons, second and third shell 8 electrons
Nucleon number
Proton + Neutron
REMEMBER
PROTON is ALWAYS EQUAL to ELECTRON
Isotopes
same element, different nucleon number. similar chemical properties but different physical properties
Cation
atom loses ions to form positive ions
Anion
Atoms gains ions to form negative ions
Ionic Bonding
TRANSFER of atoms from METAL to NON METAL to gain stable arrangement
Covalent Bonding
SHARING of atoms between atoms of NON METAL to gain stable arrangement
Period
Horizontal rows; Number of shell
Group
Vertical column; shows valence electron
properties of Ionic compounds
usually crystalline solid at r.t.p
properties of Ionic compounds
high melting and boiling points
properties of Ionic compounds
cannot conduct electricity when solid but only in molten or aqueous solution
properties of Ionic compounds
soluble in water
properties of covalent bond
Low M.p and B.p
properties of covalent bond
cannot conduct electricity in ANY PHYSICAL STATE
properties of covalent bond
soluble in organic solvents but NOT in water
Elements
made of one kind of atom
Mixture
made up of two or more elements physically combined together * note: can be separated
Compounds
made up of two or more elements chemically combined together * note: cannot be separated
