ATOM HISTORY
In 500 BCE Leucippus and Democritus said that atoms are ______
Uncuttable or Indivisible
This are the fixed path around the nucleus of an atom
Shell or Energy Level
A subatomic particles that found outside the nucleus and has a mass of ~0 a.m.u.
Electrons
This are atoms of the same elements that has different number of neutrons
Isotopes
This are forms of matter that have the same properties throughout a given sample.
Pure substance
What law does Dalton based his postulate about atoms cannot be created nor destroyed?
Law of Conservation of Mass
The maximum electron present in the Energy Level 4 or designation N is ______
32 electrons maximum
What do you call the outermost electrons in an atom?
Valence electrons
The sum of protons and neutrons which varies among isotopes
Mass number
It shows how electrons are arranged in energy levels and orbitals
Electron configuration
This model states that electrons orbit the nucleus in a fixed energy levels
Planetary model or Bohr’s planetary model
An atom element with 19 proton is _______
Potassium or K
Identify the mass number for the following element:
Gold p+ = 79, n0 = 119
198 mass number
Write the element symbol for 10 proton, 10 electron, 12 neutron
10Ne22
He created the first widely accepted periodic table
Dmitri Mendeleev or Mendeleev
This model describes electrons in an atom as waves, and not as particles.
Quantum mechanical model
Draw the correct orbital diagram for the following electron configuration 5f10
UD UD UD U U U U
-3 -2 -1 0 1 2 3
Enumerate the elements 11-15 eyes closed or eyes are covered
Sodium, magnesium, aluminum, silicon, phosphorus
716N
Element name: ______
#p+: ______ #n0: ______
Nitrogen
p+ = 7
n0 = 9
Write the electron configuration for the Sodium element
1s2 2s2 2p6 3s1
Rutherford’s gold foil experiment led to the discovery of the
Nucleus
Neutral atom of Calcium has a total of ________ electrons
20 electrons
Shell, Subshell, Orbital, Electron spin, and Diagram of the 4p4
n=4, L=1 ml= -1, ms= - ½
UD U D
-1 0 1
CL = A = 17 | Z= 35 | #p+ = 17 |#e– ___ |
#n0 = ___
e- = 17 | n0 = 18
Electron configuration of Gold-47
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d6 5p3