Answer:
Cs > Iron > Aluminum > Carbon > Neon
Explanation:
The most metallic from the given choices is Cesium and the least metallic is Neon.
Neon is noble gas and not a solid.
Metallic character of elements decreases across the period and increases with increasing electronegativity.
The most leftward element is Cesium and will be the most metallic. Neon has the least metallic character since it is a noble gas.
Cesium > Iron > Aluminum > Carbon > Neon
