![]() ![]() Question: What kind of electric charge does a proton have? Answer: A proton has a positive electric charge. Question: What kind of electric charge does an electron have? Answer: An electron has a negative electric charge. Sodium chloride, for instance, is a compound of sodium and chlorine. Question: What do we call a blend of two chemical elements? Answer: A compound is a substance formed when two or more chemical elements combine. Question: How many electrons does a sodium atom have? Answer: Sodium has 11 electrons. It is inert-that is, it doesn’t react with other elements. It is lighter than air and is sometimes used in balloons. Question: What element is almost as light as hydrogen? Answer: Helium is the second lightest element and normally occurs as a gas. It has an atomic weight of 196.967 iron has an atomic weight of 55.84. Question: Which of these is heavier than iron? Answer: Gold is heavier than iron. Question: Which of these is not a rare-earth element? Answer: The rare-earth elements, which include lanthanum, terbium, and samarium, are not really rare but mostly are hard to get to. Ins and Outs of Chemistry Question: Which of these is not made from potassium compounds? Answer: Potassium compounds are used for making soap, glass, match heads, gunpowder, fireworks, disinfectants, drugs, and paints. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.From tech to household and wellness products. Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives. ![]()
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