ELEMENTS Element Definition: A chemical element is a substance that cannot be broken down by chemical means. Elements are defined by the number of protons they possess. These are the first 20 elements, listed in order: 1 – H – Hydrogen 2 – He – Helium 3 – Li – Lithium 4 – Be – […]
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In our daily life, we come across many objects, the knowledge about which can be gained by one or more of our senses like sight, touch, hearing, taste and smelling. These objects possess mass, occupy space and may have different shapes, sizes and colours. All these objects constitute matter. Matter may thus, be defined as
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States of matter Matter is anything that occupies space. Matter exists in three states: solids, liquids and gases. Matter can be changed in various ways which includes physical, chemical and nuclear changes. a) Physical changes– they are normally reversible and no new substances formed. Examples are; (i) Change of state such as melting and vaporization
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