Natural elements Synthetic or man-made elements Compounds Mixtures Atoms An atom is a basic unit of matter that consists of a central nucleus surrounded by negatively charged electrons. The nucleus contains protons and neutrons. Electrons revolve around the nucleus in different orbits. ...
Mixturesare formed by just mixing or 'intermingling' (another word which means the same as 'mixing') together two or more substances.Those substances may also be referred to as 'constituents' or 'components' - and may be eitherelementsorcompounds, and be composed of eitheratomsormolecules.There...
Chemistry is the scientific discipline involved with elements and compounds composed of atoms molecules and ions: their composition structure properties behavior.,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、
compoundselements化合物chemistry元素introduction F4 CHEMISTRY INTRODUCTION ELEMENTS COMPOUNDS CHEMISTRY CHEMISTRY MATTER (SUBSTANCE) CHANGE (REACTION) Studyof MATTER METAL& NON-METAL NON-METAL CLASSIFICATIONOFELEMENTS METAL: characteristicproperties NON-METAL:characteristicproperties METALLOID:characteristicproperties ELE...
Isotopes of Hydrogen
four elements make up 96% of body weight. atomic structure the building blocks of elements are atoms. atoms are composed of positively charged protons, negatively charged electrons, and uncharged neutrons. protons and neutrons are located in the atomic nucleus, constituting essentially the atom's...
A compound often looks and behaves differently from its constituent elements. Consider a water (H2O)molecule, which is made up of two hydrogen atoms and one oxygen atom. Both hydrogen and oxygen aregasesat room temperature and normal atmospheric pressure. But when they combine to form water, th...
elements (except hydrogen) are known asalkali metals, and they all have similar chemical properties. The elements in group 2 (the second column) form compounds consisting of one atom of the element and two atoms of hydrogen: These are calledalkaline earth metals, with similar properties among ...
Elements, Atoms and Molecules Elements and compounds are both PURE SUBSTANCES Some substances are made of one element. This smallest particle of an element is called an atom. It is impossible to break down gold into anything simpler than gold. Some elements (such as oxygen and chlorine) will ...
All atoms areelectrically neutral, because every atom has an equal number of electrons and protons. Nearly all of the atom'smassis located in the nucleus. The nucleus is tiny compared with the total size of the atom. Most of the atom's volume holds the electron cloud, whose mass is tiny...