ALL ABOUT ATOMS Flashcards
John Dalton proposed the
“Atomic Theory.”
THREE IMPORTANT LAWS
Law of Conservation of Mass
Law of Definite Proportions
Law of Multiple Proportions
It states that matter can neither be created nor destroyed in a given
chemical reaction
Law of Conservation of Mass
It explains that a given compound always contains exactly the same
proportion of elements by mass.
Law of Definite Proportions
If two elements can be combined to form more than one compound, the
masses of one element that combined with a fixed mass of another
element are in ratios of small whole number
Law of Multiple Proportions
J. J. Thomson
electrons
He proposed the “Plum Pudding Model”
wherein the atom is composed of a positively charged
material with the negatively charged electrons scattered
through it.
J. J. Thomson
explained that electrons
travel around the nucleus at a relatively large
distance. Using the gold foil experiment, he
proposed the “Nuclear Model”
Ernest Rutherford
There is a
small, positive nucleus with the negative
electrons scattered around it.
just look at it
just look at it
discovered the neutrally charged particles
called neutrons.
James Chadwick
suggested that an electron moves around the nucleus
only in certain allowed circular orbits, called the “Planetary Model.”
Niels Bohr
is a positively charged subatomic particle located inside the nucleus.
PROTON
is a negatively charged subatomic particle located outside the nucleus.
ELECTRON
is a neutrally charged subatomic particle located inside the nucleus.
NEUTRON
It gives the number of protons in the nucleus
➢ It also gives the number of electrons if the atom is neutral.
➢ It defines a specific type of atom since each different type of atom (representing
each element) will have a different number of protons in the nucleus.
ATOMIC NUMBER
