Which subatomic particle is mobile in metallic bonding?

• A. Electron
• B. Positron
• C. Proton
• D. Neutron

Answer: (A)

Verified step by step guidance

1. Understand the nature of metallic bonding: In metallic bonding, atoms in a metal lattice share a 'sea' of delocalized electrons. These electrons are not bound to any specific atom and can move freely throughout the metal structure.
2. Identify the subatomic particles involved: Atoms are composed of protons, neutrons, and electrons. Protons and neutrons are located in the nucleus and are not free to move. Electrons, however, are located in the electron cloud surrounding the nucleus and can be delocalized in metals.
3. Consider the mobility of each particle: Protons and neutrons are tightly bound in the nucleus and do not move freely. Electrons, on the other hand, are able to move freely in the metallic lattice, contributing to the conductivity and malleability of metals.
4. Recognize the role of electrons in metallic bonding: The mobility of electrons in the 'sea' allows metals to conduct electricity and heat efficiently. This is a key characteristic of metallic bonding.
5. Conclude which particle is mobile: Based on the understanding of metallic bonding, the electrons are the subatomic particles that are mobile, allowing for the unique properties of metals.