Question

what happens when aluminum fills its valence shell? three electrons are lost, creating al+3 three electrons are gained, creating al+3 three electrons are gained, creating al-3 three electrons are lost, creating al-3

Explanation:

Step1: Identify electron - configuration of aluminum

Aluminum (Al) has an atomic number of 13, with an electron - configuration of 1s²2s²2p⁶3s²3p¹. It has 3 valence electrons in its outer shell (the 3s and 3p orbitals).

Step2: Determine the ion - formation

To achieve a stable noble - gas electron - configuration (similar to neon, which has 10 electrons), aluminum loses its 3 valence electrons. When it loses 3 electrons, it forms a positively charged ion, Al³⁺.

Answer:

Three electrons are lost, creating Al³⁺