Scientists
Proust
Law of Definite Proportions
What makes the nucleus stable? *2 things. (Coulombs Law)
Neutrons and strong nuclear force.
Location of proton, electron, and neutron
P:N, E:Orbitals (outside) N:N
# of protons in selenium
Define Mass #
# of protons and # of neutrons
Bohr
Planetary model- electrons in orbitals based on energy. Electrons orbit nucleus like planets.
Coulombs Law
Opp. Charges attract, like Chargers repel.
Charge of Proton
Positive
Atomic # of Argon
18
How are electrons placed in orbitals?
One electron in each orbital first, then paired up.
Rutherford
Gold Foil Experiment- nucleus is small, dense, positively charged, most of atom is empty space.
Law of conservation of mass
Matter can’t be created or destroyed.
Mass of electron
0 Amu
Noble gas configuration of Rb
[Kr] 5s^1
What do isotopes not have in common?
Masses
Thompson
Plum Pudding Model-discovered electron.
Law of multiple proportions
Two compounds made of the same elements. Mass ratio of elements in compounds are simple whole numbers.
Charge of neutron
0
Full electron configuration of Na
1s^22s^22p^22p^63s^1
Describe the current model of the atom
Protons and neutrons are in the nucleus (Mass of atom). Electrons are in the orbitals.
Chadwick
Discovered neutrons
Law of definite proportions
Compounds have a fixed ratio of elements. (Same element, different ratio).
Mass of proton
1 amu
Full electron configuration of As
1s^22s^22p^63s^23p^64s^23d^104p^6
Contrast electrons in ground state vs. excited state and explain how they are related to colors of light that might be produced
When extra energy is absorbed, electrons get excited and jump to a higher energy level. When they fall back from the excited state to the ground state, they give off energy (light).