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Hydrogen is a gas at room temperature and standard pressure. Nonexistent. Seaborgium is highly radioactive, with its most stable isotope having a half-life of about two minutes.


Hydrogen was first recognized as a distinct element by Henry Cavendish in 1766. Composed of a single proton and a single electron, hydrogen is the simplest and most abundant element in the universe. It is estimated that 90% of the visible universe is composed of hydrogen. Hydrogen is the raw fuel that most stars 'burn' to produce energy.


Hydrogen's state of matter is gas at standard conditions of temperature and pressure. Hydrogen condenses into a liquid or freezes solid at extremely cold temperatures. Hydrogen's state of matter can change when the temperature changes, becoming a liquid at temperatures between minus 423.18 and minus 434.49 degrees Fahrenheit.


Best Answer: Hydrogen is in the gas state at room temperature. In fact, Hydrogen is a gas at almost every temperature, condensing to a liquid at around 20 degrees C above absolute zero.


At room temperature and under standard pressure conditions, hydrogen is a gas that is tasteless, odorless and colorless. Hydrogen can exist as a liquid under high pressure and an extremely low temperature of 20.28 kelvin (−252.87°C, −423.17 °F).


Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of 7000100800000000000♠ 1.008, hydrogen is the lightest element in the periodic t

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Normal hydrogen at room temperature contains 25% of the para form and 75% of the ortho form. The ortho form cannot be prepared in the pure state. Since the two forms differ in energy, the physical properties also differ. The melting and boiling points of parahydrogen are about 0.1 o C lower than those of normal hydrogen.


At STP, Standard Temperature and Pressure, hydrogen is a gas. A gas has no definite shape and expands to fill the volume available to it. So release some hydrogen and look to see if it is a solid having a definite shape.


According to thermodynamic principles, this implies that repulsive forces exceed attractive forces between hydrogen molecules at room temperature—otherwise, the expansion would cool the hydrogen. In fact, at −68.6° C attractive forces predominate, and hydrogen, therefore, cools upon being allowed to expand below that temperature.


The compound hydrogen chloride has the chemical formula H Cl and as such is a hydrogen halide. At room temperature, it is a colourless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric water vapor. Hydrogen chloride gas and hydrochloric acid are important in technology and industry.