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Aug 22, 2019 · An element is the simplest form of matter that has a unique set of properties. One element cannot be chemically converted to another element. A compound is a substance that contains two or more elements chemically combined in a fixed proportion.
Jan 4, 2024 · A compound is a substance that is made up of two or more elements and whose composition is constant. For example, the compound we call water is created by combining the elements hydrogen and oxygen. One molecule of water is always made up of two hydrogen atoms and one oxygen atom. This is why water is referred to as H₂O in science.
May 3, 2012 · The purpose of this commentary is to initiate a reconsideration as to how, in the 21st century, should we define elements and compounds? Two recent Nobel Prizes have been given for the preparation of substances that this definition would simply call elements.
- Rollie J. Myers
- 2012
- Key points. Everything in the known universe is made up of the elements found on the periodic table. There are over 100 different element A pure substance which is made from only one type of atom.
- Elements. An element is a pure substance that cannot be broken down into any other substances. An element is made from just one type of atom The smallest particle of an element.
- The periodic table. There are 118 chemical elements. They are listed on the periodic table A table which lists all of the chemical elements and arranges them in a way that is useful.
- 1. A solid element. The particles are close together and arranged in a regular way. 2. A liquid element. The particles are close together and arranged in a random way.
Oct 17, 2020 · In chemistry, an element is defined as a pure substance composed of atoms that all have the same number of protons in the atomic nucleus. In other words, all atoms of an element have the same atomic number. The atoms of an element (sometimes called “chemical element”) cannot be broken into smaller particles by any chemical means.
A compound is a substance that contains two or more elements chemically combined in a fixed proportion. The elements carbon and hydrogen combine to form many different compounds. One of the simplest is called methane, in which there are always four times as many hydrogen particles as carbon particles.
