Question

Which electron configuration represents an excited state for an atom for calcium

Answer 1

The electron configuration represents an excited state for an atom for calcium is $\boxed{{\text{2 - 8 - 7 - 3}}}$.

Further explanation:

The electronic configuration is the distribution of electrons of an atom in the atomic orbitals. There are two states for an electron: ground as well as the excited state. The configuration of the atom in the lowest possible energy levels is called the ground-state electronic configuration.

When an electron jumps from the stable ground state to some higher level, that state is called the excited state and the electronic configuration corresponding to this state is known as the excited-state electronic configuration.

The filling of electrons in different energy levels or orbitals is done in accordance with the following three rules.

1.Aufbau principle.

2. Hund’s rule.

3. Pauli’s exclusion principle.

Calcium atom has an atomic number 20. Its stable electronic configuration will be 2, 8, 8, 2. The calcium atom has 20 electrons that are distributed into four shells. If the calcium is excited, the electron could gain energy and occupy the next available orbital. Due to this, one of the 8 electrons in the third shell gains energy and move to the fourth shell. The number of electrons presents in the third shell decrease by 1, while the number of electrons in the fourth shell increase by 1.

Electronic configuration of Calcium: $1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}4{s^2}$.

Electronic configuration of calcium for an excited state: $1{s^2}2{s^2}2{p^6}3{s^2}3{p^5}4{s^2}4{p^1}$.

In the first shell, there is two s electron, in second shell there are two s and 6p electrons, in third shell, there are 2s and 5p electron and in fourth shell there are 2s and 1p electrons in the excited state of calcium.

Hence for an excited state the electronic configuration of calcium will become 2,8,7,3.

Learn more:

1. What happens to the reducing agent during redox reaction?:brainly.com/question/2890416

2. Identification of element which has electron configuration  :brainly.com/question/9616334

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Electronic configuration of the elements

Keywords: monoatomic ion, neon, electronic configuration, Aufbau principle, Hund’s rule, Pauli’s exclusion principle, calcium, 20, 2,8,8,2 and 2,8,7,3.

Answer 2

The electron configuration that represent an excited state for an atom of calcium is 2, 8, 7, 3.

Calcium atom has an atomic number of 20 and its electronic configuration is 2, 8, 8, 2. An atom is said to be in an excited state if it gains energy and move to an higher energy level. For the calcium atom given above, there are 20 electrons which are distributed into four shells. But in the excited state [option 3], one of the 8 electrons in the third shell gains energy and move to the fourth shell. Thus, the number of electrons in the third shell reduced by 1, while the number of electrons in the fourth shell increase by 1.