Chapter 2 Flashcards
Matter is made of tiny and invisible particle called atoms
Daltons Atomic Theory
Same atoms have same mass and chemical properties
Different atoms have different masses and different chemical properties
Dalton Atomic Theory
In a chemical reaction, no atom is destroyed and no new atom is formed and mass is conserved
Dalton Atomic theory
Selected atoms are combined with fixed whole numbers for a given compound
Dalton’s Atomic Theory
Only selected atoms are combined with fixed whole numbers and mass ratio to give a particular compound
(For example, in water H2O ; 2 H atoms combine with 1 O
atom: number of H atoms / number of O atoms = 2/1)( I gram of H/8 g of C )
Law of constant Proportion
More than one type of compound for given selected atoms
N2O3;28g+48g
NO;14gN+16gO
Law of multiple proportion
Number of P + E
Atomic Number
Biggest number-atomic number=neutron
Mass number /Weight Number
Mass of P + E+ N
Atomic Mass
AMU(Atomic Mass Unit)
1.66x10^-24g
Atoms of a given element can have same atomic number and different mass number(change of neutron)
Isotopes
Average atomic mass
(amu x abundancy/100)+(amu+ abundancy/100)= Average Atomic Mass
Vertical Columns- (1A,2A,3A,4A,5A,6A,7A,8A)(3B,4B,5B,6B,7B,8B,9B,10,11B,12B)
Group
1A-8A
Main Groups
Horizontal rows
1,2,3,4,5,6,7
Period
