How many electrons does fluorine have in its first shell?
Answer: Fluorine has 2 electrons in its first shell.
Explanation: The first electron shell, often referred to as the K shell, can hold a maximum of 2 electrons. Fluorine (F), with an atomic number of 9, has an electron configuration of 1s2 2s2 2p5. In this configuration, the first shell (1s2) contains 2 electrons, and the remaining 7 electrons are distributed in higher energy levels.