Elements

A chemical that is made up of atoms of just one type is known as an element . Although all atoms are made of the same basic parts - protons,neutrons,and electrons - not all atoms are same.it is the number of these parts that gives the atoms - and the element - its properties. Grouping elements  The number of protons in an atoms of an elements gives it its atomic number.Scientists arrange elements according to their atomic numbers in a...

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Molecules

Most atoms do not exist their own,but bond with other atoms-either ones of their own type or of another element-to from molecules.atoms join together by sharing their electrons,a process known as chemical bonding. Simple molecules The natural state of oxygen is nearly always as a molecule is made up of two oxygen atoms,chemically bonded together.The oxygen in the air consists of molecules,not single atoms. Complex molecules A sulfur...

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Atoms

Atoms are the tiny building blocks that make up everything in the Universe,including ourselves.They are far too small to be seen ,even with the most powerful microscopes,Billions of them could fit on to the dot of this "i".Yet toms are themselves made up of even tinier substance particles called protons,neutrons,and electrons. Inside an atoms Atoms consist of three type of particle.At the center is a nucleus made up of protons,which have...

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Properties of matter

Different substances have different properties.they might be hard or soft,flexible or rigid,flammable or not.Testing the properties of a particular substance helps in determining what it can ,and cannot,be used for. Mass and density The amount of matter within an object is known as its mass.On Earth,the force of gravity pull o the mass of an object to give it weight .an object's density is how much mass it has for its size.For example,a piece...

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Changing States

a substance may not always in the same state of matter.it can change state when it is at different temperatures.For example , a solid can become a liquid if it become hot enough and a liquid may become a solid if it is cooled enough. Boiling and evaporation when water is heated to boiling point ,bubbles appear.These bubbles are made become some of the liquid has changed to an invisible gas called water vapor ,or steam.Water boils at 100C (212F).The...

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States of matter

Matter is everywhere,but you can not always see it.there are four main types,or states,of matter-Solid,Liquid ,Gas and Plasma. Each state is made up of moving particles,but they look and behave very differently. Solids in Solids, the particles are packed together so tightly that they vibrate rather than move around.Solid can be hard or soft ,huge or tiny,and everything in between,but they always have a fixed shape and volume,and occupy a definite...

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Matter and materials

Everything on Earth is made from different types of matter ,which behave in different ways depending on the conditions.Rock ,for example,can from solid mountains,but at high temperatures it melts and flows as lava.Exploring the way matter changes its from under different conditions of heat or pressure reveals how the Universe works at its most basic level. Understanding how materials behave in different situations shows how they can-and cannot -be...

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