10. Transition metal 11. Alkali metal 12. Alkaline earth metal 13. Rare earth metal 14. Lanthanide 15. Actinide 16. Superheavy element 17. Synthetic element 18. Radioactive element 19. Synthetic noble gas 20. Synthetic halogen

Sure! Here's a fictional non-periodic halogenic element: Element Name: Lumisium Symbol: Lm Atomic Number: 125 Atomic Weight: 320.5 Description: Lumisium is an extraordinary and rare halogenic element found only in the depths of enchanted forests. It emits a mesmerizing, ethereal glow in various shades of vibrant blues and purples when exposed to light, giving it its name. Lumisium possesses potent magical properties and is highly sought after by alchemists and spellcasters for its unique energy manipulation capabilities. Properties: - Lumisium is a highly reactive element, capable of easily forming compounds with other elements. - It has a distinct crystal structure, resembling intricate, luminescent fractals when in its pure form. - Its luminescent properties amplify when exposed to magical energies, enhancing its spectral glow. - Lumisium is known to emit a subtle, enchanting fragrance similar to fresh flowers. - It has a relatively low melting point, allowing it to be melted and molded into exquisite jewelry and magical artifacts. Applications: - Lumisium's luminescent properties make it an ideal material for constructing magical lanterns, staffs, and amulets that emit enchanting lights. - When combined with other elemental ingredients, Lumisium can create powerful potions and elixirs that enhance magical abilities or provide temporary invisibility. - It is a crucial component in advanced spell-casting rituals, helping to channel and amplify magical energy. - Lumisium's highly reactive nature makes it desirable for alchemists seeking to produce potent potions or create elemental catalysts for transmutation. Please note that this fictional element is created purely for entertainment purposes and does not exist in reality.