Science - Elements
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22 terms
Terms | Definitions |
|---|---|
 Element | any material that cannot be broken down into simpler substances |
| Metal | Elements share common properties. an element that is shiny and conducts heat and electricity well |
| Atom | the smallest component of an element having the chemical properties of the element |
| Nucleus | The center of an Atom |
| Proton | positively charged particle of an atom |
| Atomic number | the number of protons in an atom |
| Neutron | particle with no charge |
| Electron | particle with a negative charge |
| Atomic mass | total mass of the protons and neutrons in an atom, measured in atomic mass units |
| Molecule | a combination of two or more atoms |
| Periodic table | an arrangement of elements in which the elements are separated into groups based on a set of repeating properties |
| Metalloids | elements with properties that fall between those of metals and nonmetals |
| Nonmetals | Elements that are dell, poor conductors and brittle |
| Properties of elements | State of matter at room temp, metals, NonmetalsElements or metallics, the way they combine with other metals |
| Most elements are this at room temp | Solid |
| Chemically reactive | More likely to combine with other elements to form a new substance |
| Chemical formula | A way of describing molecules using letters and numbers |
| H2O | Water |
| NaCl | Salt |
| CO2 | Carbon dioxide |
| Top row of periodic table | Lanthanides |
| Bottom row of elements | Actinides |
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