Term
| The Number of potons in the nucleus of an atom is called the ... |
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Definition
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Definition
| The protons have 1 elctron and they cancel each other out. |
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Term
| What is a unit of measurement for the mass of particles in atoms? |
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True or false?
Atoms of a particular element can have diffrent number's of neutrons. |
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Definition
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Term
True or False?
Atoms of a particular element always have the same number of protons. |
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Definition
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Term
True or false?
The mass of atoms of a particular element can vary. |
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Definition
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Term
True or false?
Neutrons play an important role in chemical reactions. |
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Term
| The space in which the electrons move is huge compared to the space occupies by the _________. |
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Definition
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Term
| What are the electrons farthest from the nucleus called? |
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Definition
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Term
| What moves between 2 atoms when a chemical bond forms between the atoms? |
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Term
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Definition
| positively charged, in the nucleus. |
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Term
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Definition
| negetively charged, moves around nucleus. |
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Term
| What does an atom consist of? |
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Definition
| It consists of a nucleus surrounded by 1 or ore electrons. |
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Term
| What are 2 ways in which valence electrons move between atoms? |
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Definition
they can be transferred
They may be shared. |
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Term
| A way to show the number of valence electrons an atom has, using dots around the symbol of an element, is a __________ |
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Term
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Definition
| neutral charge, in the nucleus. |
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Term
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Definition
| central core of the atoms consists of protons and neutrons. |
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Term
| what are two things that can happen when an atom forms a chemical bond. |
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Definition
valence electrons increase to eight.
all of the electrons are given up. |
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Term
| when atoms end up with eight or zero valence electrons, how are they diffrent? |
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Definition
| they become either less or more reactive. |
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Term
| what did dmetri mendeleev recognize in 1869? |
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Definition
| a system that applied to all elements. |
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Term
| what is the atomic mass of an element's atoms. |
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Definition
| it is the average mass of am element's atoms. |
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Term
| what R 2 especially importra.nt properties that mendeleev noted about the elements |
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Definition
Repetition in properties.
pattern in increased atomic mass. |
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Term
| Mendeleev noticed that patterns appeared when he arranged the elements in what way? |
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Definition
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Term
| A chart of the elements showing the reapeting patern of their properties is called _________> |
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Definition
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Term
| What does the word periodic mean? |
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Definition
| a regular repeated pattern. |
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Term
| How many missing elements did mendeleev predict he would discover? |
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Term
| in the MODERN periodic table elements are arranged according to their? |
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Definition
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Term
| where does the periodic table become wider? |
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Term
| From an elements position on the periodic table you can predict its _______. |
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Definition
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Term
| What does each square of the periodic table usually include? |
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Definition
| Atomic #, Atomic Mass, element Symbol, element name. |
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Term
| How can an element;s properties B predicted? |
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Definition
| Fromit's location on the periodic table. |
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Term
| Element's im a column are called? |
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Definition
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Term
Treu or False?
element's in a group all have the same atomic mass. |
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Definition
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Term
T ot F?
All elements in a group have similiar characteristics? |
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Definition
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Term
T or False
elements in a group all have similiar atomic #? |
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Definition
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Term
elemnts in a group have the same chemical symbol?
T or F? |
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Definition
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Term
| A horizontal row acroos the periodic table is called a ____. |
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Definition
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Term
T or F?
The elements in each period are not alike in properties. |
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Definition
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Term
| Why does the periodic table work? |
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Definition
| it's based on the structure of atoms, especially the valence electrons. |
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Term
| The # of Valence electrons in a row of eight increase from 1 to __. |
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Definition
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Term
| Why do elements in a family have similiar properties? |
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Definition
| because they have the same # of valence electrons. |
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Term
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Definition
the # of V.E. an element hsa increases from left to right across P.T.
The properties across a period change regularly.
all elements in a family have the same # of valence electrons. |
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