The introduction of the electron microscope in the 1930's filled the bill. Co-invented by Germans, Max Knoll and Ernst Ruska in 1931, Ernst Ruska was awarded half of the Nobel Prize for Physics in 1986 for his invention.
Tetrahedral
ions
The valence electrons.
1s2 2s2p6 3s2p6 4s1
On, flouride gains an electon when it ionizes.
2, 8, 18, 18, 4
Trigonal Planar
state n federal laws
Louis Dot, like no joke
electronegitivity is a electon with a negative charge that can not be altered from its original state
neutron is the neutral due to combination of positron and anti electon
because they have completely filled orbitals