Crossword puzzle clue "prefix signifying the element at the heart of this puzzle's theme"

Prefix signifying the element at the heart of this puzzle's theme

Prefix signifying "muscle"

Cornish prefix, signifying town.

New element in each of this puzzle's theme answers

Process by which an element's atomic number may be reduced, and a hint to this puzzle's theme

New element whose name will be ratified in January, 2010, and whose symbol appears in the middle of this puzzle's theme answers

Element whose chemical symbol is used in this puzzle's theme

Hidden element in this puzzle's theme