is unicron a decepticon

No, he is not. He has no allegience, he simply wants to destroy the univerese and every thing in it.

sort of, hes a giant plannet biult দ্বারা a monkey (thats G1 for you) but the monkey lot control of unicron. but unicron has a weakness, the matrix of leadership. Rodimus prime destroyed unicron and now his just a head floating in space.(more info) he destroys plannets and moons for energy as he continually destoys them.

no

yeeeeeeeees

no, if he was then why in the movie did he try 2 destroy cybertron?! decepticons were on cybertron then!?

he is actually primus's evil brother.p.s primus transforms from the planet cybertron

I think so.

No he wants to destroy all Transformes it is seen in Armada.

Allow me to answer your প্রশ্ন too the best of my ability. According to ট্র্যান্সফর্মার lore, before the dawn of time, Order and Chaos existed within an extra-dimensional entity known as The One. To explore the fledgling universe, he created the astral being known as Unicron, and then subdivided him, creating his twin, Primus.

Unicron is the eternal arch-enemy of his twin brother Primus. Also known as the Lord of Chaos, the Chaos Bringer, and the Planet Eater, he is dedicated to consuming the multiverse. His massive form is powered দ্বারা the consumption of planets, moons, stars, and even the very fabric of existence.

So, no Unicron is not a Decepticons দ্বারা any means. He's his own entity who's sole desire is destroy everything in existence, including the Decepticons.