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6th Mcclendon_Brie PS > Test - Atomic Structure > Flashcards

Test - Atomic Structure Flashcards

1
Q
  1. Each family in the periodic table has its own characteristic properties based on the number of ___________
A
  1. Valence electrons. NB. Pg. 4
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2
Q
  1. A neutral atom may contain 8 protons _ neutrons and _ electrons
A
  1. 9 neutrons and 8 electrons
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3
Q
  1. Which particles determine the atomic number of an element?
A
  1. Protons only. NB. Pg. 5
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4
Q
  1. The maximum number of electrons that can occupy the 2nd shell of an atom of magnesium ______
A
  1. 8.
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5
Q
  1. What is the correct electron arrangement for sulfur?
A
  1. 2 - 8 - 6 . NB. Pg . 16
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6
Q
  1. An unstable nucleus results from too many or too few __________
A
  1. Neutrons. NB. Pg. 4
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7
Q
  1. An atom is electrically neural because _________
A
  1. The number of protons and electrons are equal. NB. Pg 5
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8
Q
  1. How do you tell how many energy shells there are?
A
  1. You look at what period the element is in.
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9
Q
  1. When looking at halogens on the periodic table , how does the number of valence electrons change as the energy level is increased ?
A
  1. The total number of valence electrons does not change. It remains at 7.
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10
Q
  1. What is the mass number for 42K ?
A
  1. 42.
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11
Q
  1. If there are 3 neutrons and 2 electrons find the isotope symbol, atomic # , mass #, and number of protons.
A
  1. Heleium - 5, 2, 5, 2.
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12
Q
  1. Who arranged elements on the periodic table based on atomic number?
A
  1. Henry Mosley
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13
Q
  1. Who created the solid sphere model; elements are atoms with different masses?
A
  1. Dalton.
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14
Q
  1. Nuclear model; gold foil experiment allowed him to discover that the nucleus was the positively charged center of an atom surrounded by negativily charged electrons.
A
  1. Ernest Rutherford
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15
Q
  1. Which group contains elements with two valence electrons?
A
  1. Group 2, alkaline earth metals
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16
Q
  1. Describe one similarity and one difference between carbon - 42 and 10Be.
A
  1. Same = same # of valence electrons e- group.

Difference = # of energy levels bc different periods.

17
Q
  1. Write the isotope carbon with 7 neutrons in nuclear and hyphen form .
A
  1. 13C, carbon - 13.
18
Q
  1. Is Carbon - 13 the most common form of the isotope?
A
  1. No bc average atomic mass is 12.011 on the periodic table.
19
Q
  1. List the following under the categories of metals, nonmetals and metalloids and then list their properties.
    Ar, Al, Na, Te, H,F
A
  1. Metals : aluminum and sodium - good conductor
    Nonmetals = argon , hydrogen, Fluorine- poor conductor
    Metalloids = Tellerium - semi - conductor
20
Q
  1. The atomic number of magnesium is 12. Therefore the nucleus must contain ______
A
  1. 12 protons and no electrons

6th Mcclendon_Brie PS (5 decks)

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