Question

In the periodic table, the elements are arranged in
the periods following the
1) Hund's rule of maximum multiplicity
2) Pauli's exclusion principle
3) Aufbau principle
4) Both (1) and (2)

Answer 1

Answer:

the elements are arranged in 4)

Answer 2

Answer:

Both 1 and 2

Explanation:

1) Hund's rule of maximum multiplicity- Hund's rule of maximum multiplicity is a rule based on observation of atomic spectra, which is used to predict the ground state of an atom or molecule with one or more open electronic shells. The rule states that for a given electron configuration, the lowest energy term is the one with the greatest value of spin multiplicity.[1] This implies that if two or more orbitals of equal energy are available, electrons will occupy them singly before filling them in pairs. The rule, discovered by Friedrich Hund in 1925, is of important use in atomic chemistry, spectroscopy, and quantum chemistry, and is often abbreviated to Hund's rule, ignoring Hund's other two rules.

Pauli's exclusion principle- the Pauli exclusion principle (German: Paulisches Ausschließungsprinzip) states that two or more identical particles with half-integer spins (i.e. fermions) cannot occupy the same quantum state within a quantum system simultaneously. This principle was formulated by Austrian physicist Wolfgang Pauli in 1925 for electrons, and later extended to all fermions with his spin–statistics theorem of 1940.

FINAL ANSWER- option-d

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