Yes, Be2-1 exists in the gas phase.
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it is in gas state only
There are actually quite a few more phases of matter, but the commonest three known are solid, liquid, and gas. Some texts cite as many as fifteen. At super-cold temperatures a phase with unusual properties, known as BEC can be manifest (Bose-Einstein Condensate); at very high temperatures, electrons can dissociate from their atoms in the Plasma phase. Between and within phases are sub-phases, sone of which describe matter during changes in phase (phase transition) and some of which are stable.
s is positive and g i s negative at all temperatures
No, a kite is not a gas. It will never be a gas, and even if it was a gas it would be noted in the Periodic Table.
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