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Lesson 4.3/4 Atoms
Supporting atomic properties and isotopes
| Term | Definition |
|---|---|
| Mendeleev | Created the first periodic table. Arranged elements by increasing atomic mass |
| atomic number | the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table. |
| periodic table | A chart of the elements showing the repeating pattern of their properties which is organized by atomic number |
| Ions | charged atoms which are created by gaining or losing electrons |
| Cations | positively charged ions , created when atoms lose electrons |
| Anions | negatively charged ions, created when atoms gain electrons |
| Ionization | the process of adding or removing electrons from an atom or molecule, which gives the atom or molecule a net charge |
| mass number | the total number of protons and neutrons in the nucleus of an atom |
| Isotope | An atom with the same number of protons and a different number of neutrons from other atoms of the same element. |
| atomic mass | the weighted average of the masses of the isotopes of an element |
| atomic mass unit | a unit of mass that describes the mass of an atom or molecule |
| percent natural abundance | the percentage amount of each isotope of an element in a naturally occurring sample of the element |
| Finding the number of neutrons | mass number - atomic number |
Created by:
Sara_Kellogg21
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