Homework Answers
19. Quantum theory
The idea of location of an electron being an electron cloud is presented by quantum theory. Quantum theory does not study the location of a single electron at a definite time. It studies the probability of finding electron at a place. The probability gives nothing but the location of electron cloud.
All the other given theories presents and studies individual electrons.
20.
The given electronic configuration represents Sb51
Here 51 represents the atomic number and in the given electronic configuration the exponents represent the number of electrons in each shell.
The number of electrons in the atom corresponds to the atomic of the atom here = sum of the exponents in electronic configuration
= 2+2+6+2+6+10+2+6+10+2+3 = 51
Thus in the given options tin is the atom with 51 atomic number.
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