Electron Orbits

Defining the orbits of electrons and the maximum number at any level
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Questions #: 11
Time: 5 minutes
Pass Score: 80.0%
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In the Bohr model, a number of electrons will normally occupy a single orbit (or level), but the maximum number that can be at any level is strictly limited (two in the first, eight in the second, and eight in the third).  For example, helium has two electrons orbiting at the first level; lithium has the third electron in a higher orbit.

The system of limiting the number of electrons in an orbit an excluding others is called the Pauli Exclusion Principle

Boron (B) has five electrons. How many will be in its outer orbit?

electron_orbit.gif

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Sodium (Na)

  • How many electrons does sodium (Na) have all together?
    • In the innermost orbit?
    • In the second orbit?
    • In the outer orbit?

Enter numeric figures only

 

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There is a tendency for an atom to want to have its _________ electron level full

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Which atom has only two electrons?

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Which atom has two electrons in its first orbit and eight in its next orbit (and non other electrons)?

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Which atom has its first three orbits full (18 electrons in all)

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Refer to the periodic table, which column are helium, neon, and argon are in?

periodic_table.jpg

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The noble gases do not react chemically with other atoms

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All other atoms of all of the elements, other than noble gases, tend to combine with other atoms

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It is found that atoms in the first column unite with the column

periodic_table.jpg

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With elements of which column would you expect column 2 elements to unite in a 1-to1 ratio?

periodic_table.jpg

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