Unit: Structure of Matter
Concept: Atoms and Subatomic Particles
Terms : Hide Images
| 580994550 | Atom | The smallest part of an element that can exist alone | |
| 580994551 | Proton | The positive part of an atom | |
| 580994552 | Electron | The negative part of an atom | |
| 580994553 | Neutron | The neutral part of an atom | |
| 580994554 | Nucleus | The center of an atom; protons and neutrons are found here | |
| 580994555 | Atomic Number | The number of protons in an atom | |
| 580994556 | Isotopes | Atoms of the same element with different numbers of neutrons | |
| 580994557 | Mass Number | The number of protons + neutrons in an atom | |
| 580994558 | Matter | Anything that has mass and volume | |
| 580994559 | Element | Matter made of only one type of atom | |
| 580994560 | Compound | Two or more elements chemically combined | |
| 580994561 | Mixture | Two or more elements and/or compounds physically combined | |
| 580994562 | Electron cloud | The area around the nucleus of an atom where the atom's electrons are most likely to be found | |
| 580994563 | Energy level | orbital where electrons are found according to the Bohr's planetary model of the atom. | |
| 580994564 | Group | a vertical column of elements in the periodic table; elements in a group share chemical properties | |
| 580994565 | Metalloid | an element that has some properties characteristic of metals and some of nonmetals | |
| 580994566 | Metal | a class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity | |
| 580994567 | Metalloid | found along stair-step line on the periodic table | |
| 580994568 | Metal | found to the left of the stair-step line on the periodic table | |
| 580994569 | Nonmetal | element that usually is a gas or brittle solid at room temperature, is not malleable or ductile, is a poor conductor of heat and electricity, and typically is not shiny | |
| 580994570 | Nonmetal | found to the right of the stair-step line on the periodic table | |
| 580994571 | Period | a horizontal row of elements in the periodic table | |
| 580994572 | Periodic Table | an arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same column, or group | |
| 580994573 | Subatomic Particle | an electron, proton, or neutron; one of the three major particles of which atoms are composed | |
| 580994574 | Valence Electron | an electron that is found in the outermost shell of an atom | |
| 580994575 | Valence Electron | determines an atom's chemical properties |
