Atomic Bonding (Leaving Cert Engineering): Flashcards

2 electrons in 1st shell, 8 in outer shells

When atom has full outer shells (2-8 rule satisfied)

Closely packed with strong bonds, cannot move freely

Roll over each other with ease but remain attracted

Attracted but not strictly bound, move freely with space

Covalent, ionic, metallic

Atoms share electrons from outer shells

Primary bonds - very strong and difficult to break

A charged atom (positively or negatively charged)

Bond formed when charged ions attract electrostatically

Secondary bonds - weaker, can be broken with heat

Sea of delocalised electrons around positive metal atoms

Delocalised electrons can move freely through metal