| A | B |
|---|
| located in nucleus | protons and neutrons |
| not located in nucleus | electrons |
| have a positive charge | protons |
| have no charge | neutrons |
| have a negative charge | electrons |
| has (significant) mass | protons and neutrons |
| mass of an atom is located in the... | nucleus |
| max. # electrons in first orbit (shell, energy level) | 2 |
| atomic number is the ... | number of protons |
| the number of electrons equals the number of ... | protons |
| atomic mass is the number of ___ + ___ | protons + neutrons |
| max. # of electrons in each orbit (shell, energy level) | 2, 8, 18, 32 |
| atoms with same number of protrons but different number of neutrons | isotopes |
| opposite charges ... | attract |
| same charges ... | repel |
| 100 degrees K = ____ degrees C | -173.15 |
| 100 degrees C = ____ degrees K | 373.15 |
| Iron has 26 protons and a mass of 55.845, how many neutrons? | 30 |
| Iron has 26 protons and a mass of 55.845, how many electrons? | 26 |
| Iron has 30 neutrons and a mass of 55.845, how many protons? | 26 |
| atoms often give off light when energy is ... | lost |
| when electrons are at lowest possible level... | ground state |
| would an atom with electrons 2,8,4 be ground state? | yes |
| would an atom with electrons 2,8,14, 1 be ground state? | no |
| Greeks thought there were 4 elements. name them... | earth, air, fire, water |
| atomic mass - # protons = ___ | # neutrons |
| atomic mass - # neutrons = ___ | # protons |
| # protons + # neutrons = ___ | atomic mass |
| if atomic # is 24 & atomic mass is 51.996, how many electrons, protons, and neutrons? | 24 protons & electrons, 28 neutrons |
| atomic mass is not a whole number because... | there are different isotopes with varying number of neutrons |
| degrees K = degrees C ____ 273.15 | + |
| degrees C = degrees K ____ 273.15 | - |
| metals are on the ___ side of the periodic table | left |
| noble gases are on the ____ side of the periodic table | far right |
| non-metals are on the ___ side of the periodic table | right |
| rows going across the periodic table are called ___ | Periods |
| colums (up and down) are called ... | Groups |
| _____ (groups or periods) have similar properties | Groups |
| ___ are colorless, odorless, and very unreactive | noble gases |
| Group 1A is ____ (more or less) reactive than group 2A | more |
| metals become ___ (more or less) reactive as you move to the right within a period | less |
| ____ configuration determines chemical properties | electron |
| elements are classified as ___, ___ & ___ | metals, non-metals, and metaloids |
| common properties of metals are ___, ___, & ___ | good conductors of heat & electricity, usually solids at room temp, and usually ductile |
| ductile means that... | it can be drawn into a thin wire |
| nonmetal are ___ (poor or good) conductors | poor |
| as you move across a period, left to right, elements become ___ (more or less) metallic | more |
| elements within a ____ have the same number of valence electrons | group |
| Alkali metals have ___ valence electron | 1 |
| Group 1A is call the ___ metals | alkali |
| Group 2A is called the ___ metals | alkaline Earth |
| Alkaline Earth metals have ___ valence electrons | 2 |
| Group 8A is called ___ | noble gases |
| Group 5A have what in common | 5 valence electrons |
| The electron that is in the highest occupied energy level of an atom is called the ___ | valence electron |
| Reactivity in Group IA increases as you move ____ the group | down |
| Reactivity in Group VIIA increases as you move ____ the group | up |
| softer metals are located to the ___ within a period | left |
| conductivity ___ as you move to the right within a period (metals) | increases |
| Group VIIA is called the ___ | halogens |
| Nitrogen has ___ valence electrons | 5 |
| Nitrogen has ___ electrons | 7 |
