8th grade 1st 9 weeks assessment
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| At atom is composed of what three subatomic particles? | protons, neutrons, electrons
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| Subatomic particle with a negative charge | electron
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| Subatomic particle with a positive charge | proton
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| Subatomic particle with a no charge | neutron
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| What two subatomic particles are in the nucleus of an atom | protons and neutrons
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| The protons and neutrons combine to make the | atomic mass
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| When there are more protons than electrons the atom will have a _________________ charge | positive
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| An atom will have a negative charge when there are more _________________ than protons | electrons
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| What is the atomic mass of an atom referring to? | the sum of the number of protons and the number of neutrons
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| The reactivity of an atom is most influenced by | the number of valence electrons
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| An atom of an element has 12 protons. How many electrons does the atom have to have if it has a charge of +2? | 10
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| What two subatomic particles are found in the nucleus of at atom? | protons and neutrons
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| Does the proton in the nucleus have mass? | yes - it contributes to the atomic mass
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| Do the electrons of an atom contribute to the atomic mass? | no- their mass is so small it is not included in the atomic mass
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| Do the neutrons in the have mass? | yes - they contribute the to the atomic mass?
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| A neutral atom has an equal number of positive and negative charges. If a neutral oxygen atom has 8 protons and 8 neutrons, how many electrons will it have? | 8
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| If an atom has 9 positively charged particles, what must it also have to become a neutral atom? | 9 electrons
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| What is the charge of an atom with 9 protons, 9 electrons, and 9 neutrons? | 0 - its neutral
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| What is the charge of an atom with 7 protons, 11 electrons, and 8 neutrons? | -4
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| What is the charge of an atom with 5 protons, 5 electrons, and 4 neutrons? | 0 - its neutral
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| What is the charge of an atom with 6 protons, 5 electrons, and 7 neutrons? | +1
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| What is the mass of an atom that has 14 protons, 15 neutrons, and 14 electrons? | 29 amu
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| The charge of an atom is determined by | the number of electrons and protons
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| What two subatomic particles contribute the most to the mass of an atom? | protons and neutrons
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| A certain atom has 15 electrons, 13 neutrons, and a charge of -1. What is the atomic mass? | 27 (13 neutrons + 14 protons)
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| What is the mass of an atom with 7 protons, 7 neutrons, and 8 electrons? | 14 amu
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| An element can be identified by its unique number of | protons
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| Elements that have _____ or _____ valence electrons are the most reactive. | 1 or 7
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| When moving across a row in the Periodic Table, what increases? | atomic number
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| When moving down a column in the Periodic Table, what stays the same? | the number of valence electrons
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| Most of the elements on the Periodic Table are | metals
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| The elements in the upper right hand side of the Periodic Table are | non-metals (gases)
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| Elements in the same group (column) have similar chemical properties. | True
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| On the Periodic Table, the numbers on top of the groups tell how many ________________________ an atom has. | valence electrons
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| Sulfur has an atomic number of 16 and belongs in Group 6 on the Periodic Table. Calcium has an atomic number of 20 and belongs in Group 2 on the Periodic Table. Which element has a greater reactivity and why? | Sulfur - because it has more valence electrons
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Created by:
Hillerywest