Nitrogen is the fifth most abundant element in the universe, and makes up 78 percent of the Earth's atmosphere. Nitrogen is a gas at room temperature and has an atomic number of seven. Nitrogen has a wide number of pract... More »

The number "14" is the atomic number for the element silicon, atomic weight or mass of nitrogen and the number of days in a fortnight. Valentine's Day occurs on Feb. 14. Fourteenth is the common designation for the actua... More »

NASA Solar System Exploration explains that Venus is the second-closest planet to the sun, orbiting at an average distance of 67 million miles. One year on Venus is equivalent to 225 Earth days; however, the planet's rot... More »

One interesting fact regarding the chemical element argon is that an estimated 65 trillion metric tons of argon is present in Earth's atmosphere, as claimed by one of the element's discover, Lord Rayleigh. Argon was join... More »

Carbon constitutes the sixth-most-abundant element in the universe, accounts for 20 percent of the weight of almost all living organisms, and makes up roughly 0.04 percent of the Earth's atmosphere in the form of carbon ... More » Science Chemistry

The most abundant element on Earth is oxygen, but the most abundant element in the entire universe is hydrogen. On Earth, oxygen makes up approximately 47 percent of the Earth's mass and is found both in Earth's atmosphe... More »

Some interesting hydrogen facts for kids include that it is the most common element found throughout the universe, where it is often found in stars and gas planets, such as Jupiter. Hydrogen is one of the two elements, a... More » Science Chemistry Atoms & Molecules