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Definition
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Term
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Definition
| Mass number - atomic number |
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Definition
| number of Proton + Number of neutron |
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Definition
| Elements which have different mass # |
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Definition
| a positive ion produced when one or more electrons are lost from a neutral atom |
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Definition
| a Negative ion that is produced when it gains one extra electron. |
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Term
| Who was the frst to try to explain why chemical changed occur |
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Definition
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Term
| Who was the first scientist ot recognize the importance of careful measurements? |
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Definition
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Term
| a substance was an element unit unless what? |
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Definition
| It would be broken down into two or more simpler substances |
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Term
| what is the law of constant compositon |
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Definition
| it means a given compound always has the same positoin regardless of where it comes from |
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Term
| what did John Dalton became known as |
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Definition
| Related nature to chemical properties called Dalton's atomic theory |
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Term
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Definition
Elements are made of timey particles called atoms
Atoms are indivisible in chemical process |
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Term
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Definition
| A distinct substance that is composed of the atoms of two or more elements |
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Definition
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Term
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Definition
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Term
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Definition
| Atoms witht he same number of protons but different number of neutrons |
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Term
| Smallest chemical units are called |
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Definition
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Term
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Definition
| complete electrons on outer shell and doesnt' react with other elements |
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Term
| Name the number of elements |
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Definition
| Natural 90 and Man made 26 |
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Term
| Define Law of conservation of matter |
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Definition
| Matter is unchanged during a chemical change |
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Term
| Name the most abundant element? |
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Definition
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Term
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Definition
| Makeup of compound it indicated the kinds and numbers of atoms |
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Term
| Name 2 classes of compounds |
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Definition
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Term
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Definition
| consist of two or more elements in the same porportion (always fixed ratio) |
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Term
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Definition
| molecules made up of two atoms |
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Term
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Definition
| A single atom or a group of atoms having a difficienty or excess number of electrons |
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Term
How does the trend on period table go?
IA IIA IIIA IVA VA VIA VIIA VIIIA |
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Definition
| +1 +2 +4 4 -3 -2 -1 dont ionize easily |
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Term
| what is the symbol for cation? |
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Definition
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Term
| What is the symbol of Anion |
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Definition
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Term
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Definition
| A change in the compositions of substances, due to energy involved bonds broken and formed. |
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Term
| What is appearance of chemical reaction? |
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Definition
| color change, physical state(solid gasious bubles), evolution of heat or absorption of heat, evolving of light(sound pressure) example an explosion |
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Term
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Definition
| Series of symbols to represent a chemical reaction |
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Term
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Definition
| Consist of only 1 kind of atom |
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Term
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Definition
| Shows makeup of a compound and indicates the kinds and number of atoms |
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Term
| What is Quantum Mechanical |
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Definition
| Physic theory nature of matter consist of particle also matter had waives (ligh, sound) BEST to DATE |
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Term
| Atoms consist of three main ones |
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Definition
| electron, proton and neutrons |
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Term
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Definition
| Posititron emission tomography used by positrons |
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Term
What is the subatomic makeup of:
94
SR
38 |
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Definition
| posibbly on test - look up |
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Term
| The periodical table is what? |
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Definition
| An arrangement of the elements in creasing atomic number from smallest to largest . Which reflects trends of the similiarites of their chemical and physical properties |
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Term
| On the Periodic table Rows are called what? |
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Definition
| Periods recurrances in properties |
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Term
| On the Periodic table columns are called what? |
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Definition
| Families or group, which are a collection of elements which have the most similar of chemical and physical properties |
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Term
| Metals posses common set properties what are they? |
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Definition
| Shinny, conduct electricity and heat efficiently, mostly hard. Mercury only element not solid |
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Term
| Non metals possess common set properties what are they? |
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Definition
| Brittle (will shatter) liquids and gases at room temperature, Dont' conduct electricity insulators |
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Term
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Definition
| States elements in same families will have similar chemical and physical proerties. THIS IS TRUE ALWAYS |
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Term
| Name One 2008 Nobel prize winner |
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Definition
| Discovery of subatomic particles by Kobashe |
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Term
| The ionization of the representative elements is called? |
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Definition
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