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| horizontol row in the periodic table |
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| vertical column in the periodic table |
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| repetition of properties occurs when elements are arranged in order of increasing atomic number |
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| a type of element that is a good condustor of heat and electric current |
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| type of element chracterized by the presence of electrons in the d orbital |
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| one-half the distance between the nuclei of two atoms when the atoms are joined |
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| type of ion formed by group 2A elements |
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| subatomic particles that are transferred to form positive and negative ions |
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| ability of an atom to attract electrons when the atom is in a compound |
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| energy required to remove an electron from an atom |
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| each period in the periodic table corresponds to |
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| a principal quantam level. |
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| the modern periodic table is arranged in order of increasing atomic |
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| what does the number 84 in the name krypton-84 represent? |
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| all atoms of the same element have the same |
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the first to suggest the idea of atoms
460b.c-370b.c |
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| conducted the first experiments to determine the quantity of charge carried by an electron |
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| isotopes of the same element have different |
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| how do the isotopes hydrogen-1 and hydrogen-2 differ? |
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| hydrogen-2 has one neutron, hydrogen-1 has none |
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| all elements are composed of atoms; atoms that combine do so in simple, whole number ratios; atoms of the same element are identical. |
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| what model of the atom is thought to be true? |
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| electrons are distributed around the nucleus and occupy almost all the volume of the atom |
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| neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons |
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| the smallest particle of an element that retains the properties of that element is an |
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| the sum of the protons and neutrons in an atom equals the |
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| how is the number of neutrons in the nucleus of an atom calculated? |
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| subtract the number of protons from the mass number |
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| atoms with the same number of protons, but different numbers of neutrons in the nucleus of an atom |
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| the total number of protons and neutrons in the nucleus of an atom |
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| the weighted average of the masses of the isotopes of an element |
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| 1/12 the mass of a carbon atom having six protons and six neutrons |
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| the number of protons in the nucleus of an element |
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| a subatomic particle with no charge |
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| the central part of an atom, containing protons and neutrons |
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| a positivly charged subatomic particle |
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| the smallest particle of an element that retains the properties of that element |
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| a negatively charged subatomic particle |
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| unit to measure weighted average atomic mass |
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| what is the relative mass of an electron? |
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| 1/1840 the mass of a hydrogen atom |
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| the total number of protons in an element |
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| what is another name for a homogenous mixture? |
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