Appearing in three natural isotopes, one of which is used in nuclear weapons, it was named by Lavoisier, and was used in balloons until the Hindenburg disaster.
Its spectral lines include the Paschen and Lyman series, as well as a series in the visible spectrum, all of which can be exactly calculated. Appearing in three natural isotopes, one of which is used in nuclear weapons, it was named by Lavoisier, and was used in balloons until the Hindenburg disaster. For 10 points, name this element, the most common in the human body, the Sun, and the entire universe.
Its spectral lines include the Paschen and Lyman series, as well as a series in the visible spectrum, all of which can be exactly calculated.
{hydrogen}