Oxygen is Earth's most abundant element by volume in Earth's Orbit
A ground state electron configuration follows the Aufbau Principle that states that electrons should be filled up in orbitals in increasing energy. In the given sequences, the right configuration is <span>1s2 2s2 2p6 3s2 3p6 4s2 3d8. The choice that conforms to this sequence is D. In 2) the possible confirmation that follows Aufbau's principle is D. </span>
The department of the FBI in which Natalia is most likely to work for is Questioned Documents Unit (QDU).
<h3>What is Questioned Documents Unit?</h3>
This is a unit of the FBI which is specialized in conducting forensic examinations on evidence collected during an investigation.
Such examinations may include examining documents and the instrument used to create evidences which are taken from crime scenes in order to solve the case.
Read more about Questioned Documents Unit here brainly.com/question/15246714
Na₂CO₃ → 2Na⁺ + CO₃²⁻
CO₃²⁻ + H₂O ⇄ HCO₃⁻ + OH⁻
HCO₃⁻ + H₂O ⇄ CO₂·H₂O + OH⁻
Na⁺, CO₃²⁻, HCO₃⁻, OH⁻
