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Atoms Review
Review of subatomic particles and elements
| Question | Answer |
|---|---|
| smallest part of element (basic unit) | atom |
| subatomic particle with a negative charge | electron |
| overall charge of an atom | zero (neutral) |
| subatomic particle with a positive charge | proton |
| substance that can't be broken down by chemical means; usually has a 1 or 2 letter symbol | element |
| charge of the nucleus | positive |
| subatomic particle with no charge | neutron |
| this is where you find electrons | electron cloud |
| this is where you find protons and neutrons | nucleus |
| subatomic particle that contributes to the atom's volume and reactivity | electrons |
| subatomic particles that contribute to the atom's mass | protons & neutrons |
| the number of protons only (identifies the element) | atomic number |
| the sum (or total) of protons & neutrons | atomic mass |
| change in number of electrons | ion |
| change in the number of protons | a different element |
| change in the number of neutrons | isotope |
| elements on the current periodic table are arranged this way | increasing atomic number |
| can be hammered without breaking | malleable |
| can be made into wires | ductile |
| are usually solids, shiny and GOOD conductors of heat and electricity | metals |
| are usually gases, dull and POOR conductors of heat and electricity | nonmetals |
| they have properties of metals and nonmetals and are SEMI conductors | metalloids |
| it breaks or shatters when hammered | brittle |
| vertical columns on the periodic table (18) | group/family |
| he created the first periodic table | Dmitri Mendeleev |
| horizontal rows on the periodic table (7) | period |
| Name of Group 1 elements | Alkali Metals |
| Name of Group 17 elements | Halogens |
| Name of Group 2 elements | Alkali Earth Metals |
| Name of Group 18 elements | Noble Gases |
| this is how elements on the old periodic table were arranged | increasing atomic mass |
| the smallest unit of a substance that keeps its chemical properties (usually a formula) | molecule |
| subatomic particle that identifies the element | protons |
| subatomic particles that must be in the same amount so atom can have zero charge (neutral) | protons & electrons |