What is the electronic configuration of the element with atomic number 20?
Practice Questions
Q1
What is the electronic configuration of the element with atomic number 20?
[Ne] 3s2 3p6
[Ar] 4s2
[He] 2s2 2p6 3s2 3p6
[Ne] 3s2 3p4
Questions & Step-by-Step Solutions
What is the electronic configuration of the element with atomic number 20?
Step 1: Identify the atomic number. The atomic number 20 corresponds to the element Calcium.
Step 2: Understand that the electronic configuration shows how electrons are arranged in an atom.
Step 3: Recall that the first 18 electrons fill the orbitals according to the Aufbau principle, which leads to the configuration of Argon (Ar) for atomic number 18.
Step 4: For atomic number 20, add 2 more electrons to the next available orbital, which is the 4s orbital.
Step 5: Therefore, the electronic configuration for Calcium is [Ar] 4s2.
