Question

Every atom of a metallic conductor has one or more outermost electrons which are weakly bound to the nucleus . Such electrons are called ___________ electrons​

Answer 1

Answer:

valence

Explanation:

Answer 2

Every atom of a metallic conductor has one or more outermost electrons which are weakly bound to the nucleus. Such electrons are called free electrons.

Explanation:

• All atoms have three subatomic particles- proton and neutron in nucleus and electrons revolving around the nucleus in different energy levels called orbits or shells.

• Electrons are distributed among the shell using the formula $2n^{2}$ where n is the shell number.

• When the valence electrons in an atom gain sufficient energy they can break away from the parent atom and become free electrons.

• The particles in a metal are held together by strong metallic bonds.

• Metals atoms have loose electrons in the outer shells, which form a 'sea' of delocalised or free negative charge around the close-packed positive ions. These loose electrons are called free electrons.  They can move freely throughout the metallic structure.

• These free electrons are responsible for flow of current or electrical conduction in metals.