1 All matter is composed of elements2 of which there are 118 different kind.

Apuntes

◼ All matter is composed of elements, of which there are 118 different kind. ◼ Elements are pure substances that contain only one type of material from which everything is built. ◼ They can ́t be broken down into simple substances An aluminum can consists of many atoms of aluminum. https://members.gcsepod.com/shared/podcasts/title/9932/61140 ◼ Chemical symbols are one- or two-letter abbreviations for an element’s name. ◼ When chemical symbols contain two letters, the second letter is NOT capitalized. ◼ Co is the chemical symbol for cobalt. ◼ CO specifies there are two elements present, carbon and oxygen. Aluminum, Al Gold, Au Sulfur, S Silver, Ag ◼ In the early 19 th century, scientists had started to discover more and more of the different elements that make up our world- tried to group them- very difficult. ◼ In 1872, Russian chemist, Dmitri Mendeleev created the periodic table. ◼ arranged 60 elements by increasing atomic mass and arranged elements into groups with similar properties. ◼ Four new elements were named in 2016 (nihonium, moscovium, tennesine and oganesson) ◼ There are 118 different elements ◼ 94 occur naturally ◼ 24 have been synthesised in laboratorie...