Term
| What is anything that takes up space and has mass? |
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| What is a substance that cannot be broken down to other substances by chemical reactions? |
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| What is a substance consisting of two ore more different elements combined in a fixed ratio? |
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Definition
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| What are the essential elements? |
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Definition
| Oxygen, Carbon, Hydrogen, and Nitrogen |
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Term
| What are the elements called that are requited by an organism in only minute quantities? |
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Term
| What is the smallest unit of matter that still retains the properties of an element? |
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Term
| What is the subatomic particle that has a positive charge? |
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Definition
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Term
| What is the subatomic particle that has a negative charge? |
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Definition
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Term
| What is the subatomic particle that has a neutral charge? |
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Term
| What subatomic particles are packed together tightly in the atomic nucleus, at the center of the atom? |
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Term
| How much does a neutron or proton weigh? |
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Definition
| 1.7 x 10^-24 gram, or 1 Dalton |
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Term
| How much does an electron weigh? |
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Definition
| 1/2,000 that of a neutron or proton, we ignore the mass of electrons when calculating the mass of an atom. |
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Term
| What is the number that is written as a subscript to the left of the symbol for an element? |
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Definition
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Term
| What is the sum of protons plus neutrons in the nucleus of an atom, that is written as a superscript to the left of an elements symbol? |
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Definition
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Term
| What is the total mass of an atom? |
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Definition
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Term
| What are atoms that have the same number of protons, but a different number of neutrons? |
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Definition
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Term
| What is the capacity to cause change? |
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Definition
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Term
| What is the energy that matter possesses because of its location or structure? |
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Definition
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Term
| How many electron shells are there? |
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Definition
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Term
| How many electrons can be in the first electron shell? |
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Definition
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Term
| How many electrons can the 2nd and 3rd electron shell hold? |
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Definition
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Term
| What is the outermost electron shell called? |
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Term
| In order for an atom to have a completed valance shell, how many electrons are needed in the 2nd & 3rd shells? |
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Definition
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Term
| What is the three-dimensional space where an electron is found 90% of the time called? |
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Term
| What is the sharing of a pair of valence electrons by two atoms? |
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Definition
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Term
| What is it called when two or more atoms are held together by covalent bonds? |
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Definition
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Term
| What does (H:H) or H-H represent? |
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Definition
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Term
| The attraction of a particular atom for the electrons of a covalent bond is called its what? |
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Term
| When a covalent bond between two atoms of the same element have equally shared electrons they have the same electrongativity, this is a what? |
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Definition
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Term
| When one atom is bonded to a more electronegative atom, the electrons of the bond are not shared equally, this type of bond is called a what? |
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Definition
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Term
| What is a charged atom called? |
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Definition
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Term
| A positive charged ion is an: |
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Definition
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Term
| A Negative Charged ion is an: |
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Term
| Because of opposite charges, cations and anions attract each other; this attraction is called an: |
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Definition
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Term
| Compounds formed by ionic bonds are called: |
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