Atoms are the basic structural units of matter and are made up of protons, neutrons and electrons. The atom is held together by the attraction between the electrons and the nucleus. The nucleus consists of protons and neutrons and is positively charged. And the electrons, which orbit the nucleus, are negatively charged. Protons and neutrons are particles of equal weight and electrons are much lighter in weight. An atom has an equal number of electrons and protons and is therefore electrically neutral. There are 92 different types of atoms that occur naturally, each forming the structural unit of a different element. An element is a substance that can�t be broken down or changed to other substances by regular chemical means. The number of protons in the nucleus � called the atomic number � is always consistent in the element. For example, every hydrogen atom has one proton or atomic number. And every helium atom has 2 protons. Atoms of the same element may have different numbers of neutrons. Electrons which are negatively charged, repel one another but are attracte......

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