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BIO CHAPTER TWO REVIEW SHEET - Chapter Two 1 Atoms are the...

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Chapter Two 1. Atoms are the fundamental structural units of matter that are composed of a central atomic nucleus which contains two subatomic particals (protons and Neutrons) and Electrons orbit the nucleus because they are lighter and negatively charged 2. Element is a substance that can neither be broken down nor converted to other substances by ordinary chemical means. Number of protons in the nucleus is the atomic number 3. Atoms of the same element may have different numbers of neutrons which are referred to as Isotopes, not all isotopes are radioactive 4. Electrons travel within specific regions called electron shells that correspond to different energy levels. Electrons move in limited three dimensional spaces called electron shells. The shell closest to the nucleus holds only two electrons and is at the lowest energy level. The second shell has higher energy electrons and holds eight electrons.
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