@PetraKann

“Moseley's work showed that, in 1913, only four elements remained to be discovered that had lower atomic numbers than uranium. They had the atomic numbers 43, 61, 72 and 75.”

Technetium, Promethium, hafnium and Rhenium.

@UnexpectedBooks

Excellent summary. Thanks!

@drsjamesserra

Great work man!

@RWBHere

He could still be awarded a posthumous Nobel Prize, if people could put his name forward in the correct ways.

@michaelanderson3096

You cannot see the atomic structure of living organism. However, the atomic structure of inorganic objects can be viewed using an electronic microscope.

@user-h19oid9ih2eni

Hey, where is this clip from? at 0:08