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26 Cards in this Set
- Front
- Back
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What do you call a substance that is only made out of one type of atom?
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An element
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What are elements shown in?
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The periodic table
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How is the periodic table ordered?
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They are grouped by similar properties
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What are different elements represented by?
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Chemical symbols
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What are atoms made up of?
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Protons, Neutrons & Electrons
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What kind of charges do:
Protons Neutrons Electrons Have? |
Protons: +1
Neutrons: 0 Electrons: -1 |
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How many electrons do atoms have?
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The same amount as protons
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Do atoms have an overall electrical charge?
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No
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Do atoms of the same element have the same number of protons?
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Yes
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How do you find out the number of Protons?
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It is the same as the atomic number of the element
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What does the mass number of an element mean?
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It is the sum of the number of Protons and Neutrons
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What gives elements similar properties?
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Elements in the same group having the same number of electrons in their outer shells
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What are the Noble Gases?
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Noble Gases are all the elements in group 0, they are unreactive as their atoms have stable arrangements of electrons
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What is group 1?
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Group 1 is the alkali metals
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How many electrons do group 1 have in their outer shell?
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1
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What is a chemical reaction involving elements?
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A chemical reaction involving elements is when two or more elements react to form compounds
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What does a chemical reaction involving elements involve?
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It involves giving, taking or sharing electrons
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What do compounds formed from metals consist of?
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Ions
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What do compounds formed from non-metals consist of?
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Molecules
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Are atoms lost or made in reactions?
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No
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Does the reactants' mass equal the products' mass?
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Yes
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How many electrons in 1st energy level |
two |
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How many electrons in next energy levels (up to element 21) |
8 |
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Isotopes are: |
Elements with the same number of protons, but different numbers of neutrons |
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Relative Atomic Mass |
Average mass of all isotopes of an element Hence value can indicate which isotope is most common |
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Ions |
Result from imbalance of protons and electrons The elements want to have the same arrangement as noble gases - a full outer shell |
