which numbers gives information related to atom? write about them in detail
draw a diagram which shows the order of electronic configuration
what is emission spectrum and absorption spectrum? which scientist explained them?
Answers
Answered by
2
The existence of atoms has been proposed since the time
of early Indian and Greek philosophers (400 B.C.) who
were of the view that atoms are the fundamental building
blocks of matter. According to them, the continued
subdivisions of matter would ultimately yield atoms which
would not be further divisible. The word ‘atom’ has been
derived from the Greek word ‘a-tomio’ which means ‘uncutable’ or ‘non-divisible’. These earlier ideas were mere
speculations and there was no way to test them
experimentally. These ideas remained dormant for a very
long time and were revived again by scientists in the
nineteenth century.
The atomic theory of matter was first proposed on a
firm scientific basis by John Dalton, a British school
teacher in 1808. His theory, called Dalton’s atomic
theory, regarded the atom as the ultimate particle of
matter (Unit 1).
In this unit we start with the experimental
observations made by scientists towards the end of
nineteenth and beginning of twentieth century. These
established that atoms can be further divided into subatomic particles, i.e., electrons, protons and neutrons—
a concept very different from that of Dalton. The major
problems before the scientists at that time were:
• to account for the stability of atom after the discovery
of sub-atomic particles,
• to compare the behaviour of one element from other
in terms of both physical and chemical properties,
Similar questions