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12 Cards in this Set
- Front
- Back
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Name the sub-atomic particles present in an atom.
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proton, electron, neutron
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Describe 2 characteristics of proton
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It is positively-charged and is located in the nucleus.
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Explain why atoms are electrically neutral.
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Atoms have equal number of protons and electrons, hence the positive charge will cancel out the negative charge.
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Define atomic number / proton number.
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The number of protons in an atom.
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Define mass number / nucleon number.
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The number of protons and neutrons in the nucleus of an atom.
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Describe briefly how electrons are arranged in an atom.
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Electrons are arranged in electron shells, where they can take in a fixed number of electrons.
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State the maximum number of electrons in the 1st, 2nd and 3rd shell respectively.
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1st shell: 2 electrons
2nd shell: 8 electrons 3rd shell: 8 electrons |
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Determine the number of neutrons in Si atom.
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From the Periodic Table, we observe that the proton number of silicon is 14 and the mass number is 28.
Hence, the number of neutrons is 14 (28 -14) |
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What do you understand by outermost electrons?
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Outermost electrons are found at the last shell of the atom.
Also known as valence electrons. |
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What is the significance of outer electrons / valence electrons in an atom?
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The number of outer electrons determine the chemical properties of the atom.
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What is the relationship between the number of outer electrons and the position of the atom in the Periodic Table?
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The number of outer electrons correspond to the Group number where the atom is placed.
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what is the relationship between the number of electron shells to the location of the atom in the Periodic Table?
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The number of electron shells in the atom correspond to the Period in which the atom is placed.
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