The probability density plots of $1s$ and $2s$ atomic orbitals are given in figures.
The density of dots in a region represents the probability density of finding electrons in the region. On the basis of the above diagram, which of the following statements is incorrect?
Updated On: Jul 7, 2022
$1s$ and $2s$ orbitals are spherical in shape
The probability of finding the electron is maximum near the nucleus
The probability of finding the electron at a given distance is equal in all directions
The probability density of electrons for $2s$ orbital decreases uniformly as distance from the nucleus increases
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The Correct Option isD
Solution and Explanation
For $1s$ orbital, the probability density is maximum at the nucleus and it decreases sharply as we move away from it. On the other hand, for $2s$ orbital, the probability density first decreases sharply to zero and again starts increasing.
The atomic structure of an element refers to the constitution of its nucleus and the arrangement of the electrons around it. Primarily, the atomic structure of matter is made up of protons, electrons and neutrons.
Dalton’s Atomic Theory
Dalton proposed that every matter is composed of atoms that are indivisible and indestructible.
The following are the postulates of his theory:
Every matter is made up of atoms.
Atoms are indivisible.
Specific elements have only one type of atoms in them.
Each atom has its own constant mass that varies from element to element.
Atoms undergo rearrangement during a chemical reaction.
Atoms can neither be created nor be destroyed but can be transformed from one form to another.
Cons of Dalton’s Atomic Theory
The theory was unable to explain the existence of isotopes.
Nothing about the structure of atom was appropriately explained.
Later, the scientists discovered particles inside the atom that proved, the atoms are divisible.
Subatomic Particles
Protons - are positively charged subatomic particles.
Electron - are negatively charged subatomic particles.
Neutrons - are electrically neutral particles and carry no charge
Atomic Structure of Isotopes
Several atomic structures of an element can exist, which differ in the total number of nucleons.These variants of elements having a different nucleon number (also known as the mass number) are called isotopes of the element. Therefore, the isotopes of an element have the same number of protons but differ in the number of neutrons. For example, there exist three known naturally occurring isotopes of hydrogen, namely, protium, deuterium, and tritium.
