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At atom is composed of what three subatomic particles?
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Subatomic particle with a negative charge
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8th grade 1st 9 week
8th grade 1st 9 weeks assessment
| Question | Answer |
|---|---|
| At atom is composed of what three subatomic particles? | protons, neutrons, electrons |
| Subatomic particle with a negative charge | electron |
| Subatomic particle with a positive charge | proton |
| Subatomic particle with a no charge | neutron |
| What two subatomic particles are in the nucleus of an atom | protons and neutrons |
| The protons and neutrons combine to make the | atomic mass |
| When there are more protons than electrons the atom will have a _________________ charge | positive |
| An atom will have a negative charge when there are more _________________ than protons | electrons |
| What is the atomic mass of an atom referring to? | the sum of the number of protons and the number of neutrons |
| The reactivity of an atom is most influenced by | the number of valence electrons |
| 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 |
| What two subatomic particles are found in the nucleus of at atom? | protons and neutrons |
| Does the proton in the nucleus have mass? | yes - it contributes to the atomic mass |
| 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 |
| Do the neutrons in the have mass? | yes - they contribute the to the atomic mass? |
| 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 |
| If an atom has 9 positively charged particles, what must it also have to become a neutral atom? | 9 electrons |
| What is the charge of an atom with 9 protons, 9 electrons, and 9 neutrons? | 0 - its neutral |
| What is the charge of an atom with 7 protons, 11 electrons, and 8 neutrons? | -4 |
| What is the charge of an atom with 5 protons, 5 electrons, and 4 neutrons? | 0 - its neutral |
| What is the charge of an atom with 6 protons, 5 electrons, and 7 neutrons? | +1 |
| What is the mass of an atom that has 14 protons, 15 neutrons, and 14 electrons? | 29 amu |
| The charge of an atom is determined by | the number of electrons and protons |
| What two subatomic particles contribute the most to the mass of an atom? | protons and neutrons |
| A certain atom has 15 electrons, 13 neutrons, and a charge of -1. What is the atomic mass? | 27 (13 neutrons + 14 protons) |
| What is the mass of an atom with 7 protons, 7 neutrons, and 8 electrons? | 14 amu |
| An element can be identified by its unique number of | protons |
| Elements that have _____ or _____ valence electrons are the most reactive. | 1 or 7 |
| When moving across a row in the Periodic Table, what increases? | atomic number |
| When moving down a column in the Periodic Table, what stays the same? | the number of valence electrons |
| Most of the elements on the Periodic Table are | metals |
| The elements in the upper right hand side of the Periodic Table are | non-metals (gases) |
| Elements in the same group (column) have similar chemical properties. | True |
| On the Periodic Table, the numbers on top of the groups tell how many ________________________ an atom has. | valence electrons |
| 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 |
Created by:
Hillerywest