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Atoms & Molecules (Laws (constant proportions (mass of (hydrogen (is…
Atoms & Molecules
Laws
Jospeh L proust
constant proportion
conservation of mass
neither created
nor destroye
constant proportions
mass of
hydrogen
is always 1:8
in H2O
oxygen
Proust Law"In chemical substance elements always present in definite proportions by mass
Lovoisier
conservation of matter
Dalton's
Atmos
combine in ratios of whole numbers
relative number is constant
of an element-identical in mass
& chemical properties
atomic radius is in nanometers
measured as atomic mass unit (amu)
amu
=1.6*10-24g
symbols 1or 2 letters
latin or greek
represent elements
ex:H,Co,Na
1 and 3 ex: Mg,Mn
building blocks of matter
can't be created or destroyed
atomic mass of carbon isotope is 12
1_
12th part of
amu= 1.6
10-24g*
std ref to all elements
Molecules
atoms of
same
different
elements form
molecules
of
elements
same type of elements atoms
Atomicity:no'of molecules present in one molecule.ex:O3->atomicity 3
compounds
different type of element atoms in definite proportions
2 or more atoms
chemically bonded
ions
charged species
-ve anion
(acidic radial)
Cl-
poly-atomic ions
+ve cation
(bsic radial)
Na+
=NaCl