Facts about radium and element for kids1/22/2024 ![]() 10% of your body mass is hydrogen - that means, technically, bits of you are 13.5 BILLION years old! 5. All hydrogen is this old, and it makes up about 75% of the universe's total mass. Hydrogen was the first element to exist, and it appeared at the very begining of the universe - around 13.5 billion years ago. You have some seriously old atoms in your body The reasons why are complicated, but it's basically due to the way they reflect light - different colours from the colour spectrum comes out from their unique structure. The only three metals on the periodic table that don't have a silvery shine are gold, copper and cesium. Ice is about 10% less dense than water, which is why it can float on top of water! 3. ![]() This is why it's a bad idea to freeze water in glass bottles - they will probably shatter! 2. ![]() Yep, water is a chemical - and unlike many chemicals, it gets bigger when it's cold! The volume of one ice cube is about 9% bigger than the water used to make it. Love science? So do we! Try our periodic table quiz, see how well you know the human body, have a go at our biology trivia quiz, or take a study break with these hilarious scientist jokes! 1. Is chemistry your favourite subject in school, or do you think it doesn't "matter"? Either way, you probably know a few of the basics already! Chemistry is about the study of matter and how different elements react to each other - and we can do some really amazing stuff with it! You've probably studied the element table, and you know that matter comes in solids, liquids and gases - but there's so much more to learn! We've put together twenty fun facts for you - you'll definitely learn something new today! ![]()
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