Chapter 1 - Atomic structure and the periodic table
History of the atomic Structure
-
Democritus (460 to 370 BCE)
) miniscule
↳
and invisible Spheres that cannot be cut any smaller
-
John Dalton (1766-1844)
↳ All elements are made up of indivisible particles called atons
↳ All atoms of identical and have the some wall
a given element are
↳ The atons of different elements have different masses
are now
↳ They can combine to form molecules in compounds
4) All the molecules of a given compound are identical
Some of John Dalton's theories have been proven to be incorrect
4 Indivisible Particles >
-
atens can be broken down into Subatomic Particles
4) Isetopes mean not all atons in a given element are the same
2) Isotopes mean molecules or a givee compound are not identical
Discovery of inside atoms (1847-1932)
- J J
.
. Thomson (1836-1940)
4) cathode
ray experiment (the narrow rays were deflected using charsed plates
4 Introduced Charges to the atom
)
↳
Discovered the electron
↳ Plan pudding model (positively charged cloud with electrons in it
-
Ernest Rutherford (1871-1937)
↳ Gold toil
experiment
2 Shot Alpha foil
rebounded back
particles at gold
4 Some were deflected when all should have gone through
↳
Protons are discovered
- Nuclear model (how atous are most empty space with a nucleus
, James Chadwick (1891-1974)
-
)
↳
problem with Rutherford's model is that relative masses of certain elements
did not match up (Something within the atoms of elements were giving them
more mass)
↳ Bombarded
Beryllium with alpha particles
↳ found new radiction that has no electric charge
4) Discovered the neutron within the nucleus
Atomic properties of subatomic particles
Atomic number (2) -
The total number of protons within the aton of an element
↳ The atanic what
number decides element it is
4) Every element has a unique number of proton
Mass number (A) -
The total number of protons and neutrons within the nucleus
of an atom of an element
4 Masl number is not always the same with aton
every of an
element because of isotope
4 The mess of electrons are usually isnored because they
have negtiable wass
E "He'+X
12 16
6 8
I iH general formula
History of the atomic Structure
-
Democritus (460 to 370 BCE)
) miniscule
↳
and invisible Spheres that cannot be cut any smaller
-
John Dalton (1766-1844)
↳ All elements are made up of indivisible particles called atons
↳ All atoms of identical and have the some wall
a given element are
↳ The atons of different elements have different masses
are now
↳ They can combine to form molecules in compounds
4) All the molecules of a given compound are identical
Some of John Dalton's theories have been proven to be incorrect
4 Indivisible Particles >
-
atens can be broken down into Subatomic Particles
4) Isetopes mean not all atons in a given element are the same
2) Isotopes mean molecules or a givee compound are not identical
Discovery of inside atoms (1847-1932)
- J J
.
. Thomson (1836-1940)
4) cathode
ray experiment (the narrow rays were deflected using charsed plates
4 Introduced Charges to the atom
)
↳
Discovered the electron
↳ Plan pudding model (positively charged cloud with electrons in it
-
Ernest Rutherford (1871-1937)
↳ Gold toil
experiment
2 Shot Alpha foil
rebounded back
particles at gold
4 Some were deflected when all should have gone through
↳
Protons are discovered
- Nuclear model (how atous are most empty space with a nucleus
, James Chadwick (1891-1974)
-
)
↳
problem with Rutherford's model is that relative masses of certain elements
did not match up (Something within the atoms of elements were giving them
more mass)
↳ Bombarded
Beryllium with alpha particles
↳ found new radiction that has no electric charge
4) Discovered the neutron within the nucleus
Atomic properties of subatomic particles
Atomic number (2) -
The total number of protons within the aton of an element
↳ The atanic what
number decides element it is
4) Every element has a unique number of proton
Mass number (A) -
The total number of protons and neutrons within the nucleus
of an atom of an element
4 Masl number is not always the same with aton
every of an
element because of isotope
4 The mess of electrons are usually isnored because they
have negtiable wass
E "He'+X
12 16
6 8
I iH general formula
