Question

1st attempt part 1 (1 point) to format the electron - configuration correctly make sure to superscript where needed, do not add spaces to your answer and italics are not possible in this module. write the ground - state electron configuration for calcium, ca. you may write either the full or condensed electron configuration. part 2 (1 point) write the ground - state electron configuration for chlorine, cl.

Explanation:

Step1: Recall electron - filling rules

Electrons fill orbitals in order of increasing energy following the Aufbau principle, Pauli - exclusion principle, and Hund's rule. Calcium has an atomic number of 20.

Step2: Write the full electron configuration

The order of orbital filling is 1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p etc. For calcium (Ca), with 20 electrons, the full electron configuration is 1s$^{2}$2s$^{2}$2p$^{6}$3s$^{2}$3p$^{6}$4s$^{2}$.

Step3: Write the condensed electron configuration

The noble - gas core before calcium is argon (Ar). Argon has 18 electrons. So the condensed electron configuration of calcium is [Ar]4s$^{2}$.

Answer:

Full: 1s$^{2}$2s$^{2}$2p$^{6}$3s$^{2}$3p$^{6}$4s$^{2}$; Condensed: [Ar]4s$^{2}$