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Periodic Table
Regents Chem Periodic Table
| Question | Answer |
|---|---|
| Atomic mass | how the first periodic table was arranged |
| Atomic number | how the current periodic table is arranged |
| Metals | these elements lose electrons and form positive ions smaller than their atoms. |
| Nonmetals | these elements gain electrons and form negative ions that are bigger than their atoms |
| Electronegativity | ability to attract electrons. Fluorine has the highest at 4.0 |
| Ionization energy | energy required to remove outer electron(s). The noble gases have the highest. This decreases as you move down a group because the radius increases. |
| Atomic radius | distance from the nucleus to the outer electrons. Increases moving down and group and DECREASES moving left->right across a period. |
| Nuclear strength | number of protons in the nucleus. This increases across a period and is the reason that radius decreases across a period. |
| Atomic radius in a group | atoms get bigger as you move from top to bottom in a group. This is because energy levels are added. |
| Mendeleev | Scientist who created the original periodic table |
| Moseley | Scientist who created the modern periodic table |
| The two liquid elements at STP | Mercury (Hg) and Bromine (Br) |
| The 7 diatomic elements | F, Br, Cl, I, N, O and H |
| Gases at STP | all the noble gases, F, Cl, N, O, H |
| Solid | The phases of most of the elements on the periodic table (they’re metals) |
| What it means when the atomic mass doesn’t have any decimal places | the element has NO stable isotopes. It’s most likely radioactive |
| Calculating average atomic mass | multiply each isotope by its abundance (in decimal form)…then add the results up, this is the average mass! |
| Group | vertical collection of elements on the periodic table, all with the same # valence electrons and similar reactivities. |
| Period | horizontal collection of elements on the periodic table, all with the same # of energy levels. |
| Properties of metals | lost electrons to form positive ions, Fr is most reactive, malleable and ductile, conduct heat and electricity (by mov’t of electrons) |
| Properties of nonmetals | do not conduct, brittle, tend to share or gain electrons. |
| Properties of transition metals | have colored solutions, many possible charges, lose electrons from the valence level and the next level down. |
Created by:
PRO Teacher
etucci
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