Chem Chap 4 Word Scramble
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? | Answer |
Number of element on per. table | 112 |
Number of naturally occurring elements | 88 |
(1) Chemical discoveries of 18th Cent | Most natural materials are mixtures of pure substances |
(2) Chemical discoveries of 18th Cent | Pure substances are either elements or combos of elements |
(3) Chemical discoveries of 18th Cent | Law of constant composition |
What is the law of constant composition? | Compounds will always have the same composition/amounts regardless of where elements came from |
(1) Dalton's Atomic Theory | Elements are made of tiny particles called atoms |
(2) Dalton's Atomic Theory | The atoms of a given element are different than those of any other element |
(3) Dalton's Atomic Theory | Atoms of one element can combine with atoms of other elements to form compounds |
(4) Dalton's Atomic Theory | Atoms are indivisible in chemical processes |
Atomic model w/ mostly positive - electrons spread throughout to counter positive | Plum Pudding |
Created Plum Pudding Atomic Model | Lord Kelvin |
Rutherford knew plum pudding model was false because... | Large deflections of alpha particles - concentrated positive charge that would repel alpha particles |
Nuclear Atom | An atom with dense center of positive charge (nucleus) around which tiny electrons moved in a space that was otherwise empty. Concluded nucleus must be positive charge to balance electrons. |
Isotopes | Atoms with same number of protons, but different number of neutrons |
Atomic Number | Number of protons in the nucleus |
Mass Number | Protons + Neutrons |
Columns on per. table | Groups |
Rows on per. table | periods |
Group 1 on per. table | alkali metals |
Group 2 | alkaline earth metals/transition metals |
Group 7 | halogens |
Group 8 | Noble Gases |
(1) Physical properties of metals | Efficient conductors of electricity |
(2) Physical properties of metals | Malleability |
(3) Physical properties of metals | Ductility |
(4) Physical properties of metals | Lustrous |
Upper right corner of per. table | nonmetals |
Si, Ge, As, Sb, Te | metalloids |
Non-reactive elements | Noble Gases |
diatomic molecules | made up of two atoms |
Different forms of a given element | alatropes |
Elements react more violently as you go ____ | down |
Ion | Charged particle |
Pos. Ion | Cation |
Neg. Ion | Anion |
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