![]() It doesn't matter whether you refer to it as oxygen gas, liquid oxygen, or solid oxygen, it all refers to the element oxygen.Ĭalcium carbonate (chemical formula CaCO 3) is found in limestone. If you look in the periodic table of the elements you will find oxygen (O) listed as an element. Oxygen gas (chemical formula O 2) is made up ONLY of the element oxygen (chemical symbol O) (ii) Compounds can be decomposed into simpler substances because they are made up of 2 or more elements. (i) Elements cannot be decomposed into simpler substances because they are made up of only one element. What is the relationship between what you know and what you need to find out? What information have you been given in the question? ![]() Oxygen gas (chemical formula O 2) makes up about 21% of the Earth's atmosphere.ĭecide whether oxygen gas is an element or a compound. The most common elements found in living things are: oxygen (which makes up about 21% of the atmosphere)Ĭommon elements found in the Earth's crust are:.nitrogen (which makes up about 78% of the atmosphere).The Earth's atmosphere is made up of a mixture of different gases, but is mostly made up of two elements: The most common elements found in the universe are: Neon has is an element with chemical symbol NeĬhemistry teachers often ask their students to memorise the names and chemical symbols of the first 20 elements in the periodic table of the elements, so here they are: (2) Helium is an element with the chemical symbol HeĬalcium is an element with the chemical symbol Ca ⚛ if there is a second letter in the chemical symbol of an element it is always a lower case letter ![]() Nitrogen is an element with the chemical symbol N Hydrogen is an element with the chemical symbol HĬarbon is an element with the chemical symbol C ⚛ the first letter of the chemical symbol of an element is always a capital letter (upper case letter) The chemical symbol of an element can be made up of either 1 letter or 2 letters: ![]() This chemical symbol of an element is most often based on the current name of the element, or, in some cases, it is based on an older name for the element. In addition, there are more than 20 man-made elements (synthetic elements or artifical elements).Īll the known elements, both naturally occurring and synthetic elements, are listed in the Periodic Table of the Elements.Įach element has been given a unique name and a unique chemical symbol. There are 92 naturally occurring elements. An element is defined as a pure substance that cannot be decomposed (broken down) into simpler substances.įor example, if you heat nitrogen gas it will get hotter, but it won't break down (decompose) into anything simpler than nitrogen. ![]()
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