Unit 2 - Periodicity & Electron Configuration Test Review

The energy level tells us what about an electron?

• location of the valence electrons

• shape of the electron cloud

• speed of the electron

• spin of the electron

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Which of the following statements are FALSE about electron configuration?

• electrons in the same orbital must have opposite spin

• electrons enter orbitals of the highest energy level first

• electrons enter orbitals of the lowest energy level first

• orbitals can be occupied by no more than 2 electrons

If five electrons are available to fill five empty 3d orbitals, how will the electrons be distributed in the five orbitals?

• five electrons in one orbital, none in the other four

• one electron in each orbital

• two electrons in the first and second orbitals, one electron in the third orbital

• five electrons cannot enter the 3d orbitals

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How many unpaired electrons are in an phosphorus atom (atomic #15)?

• 0

• 1

• 2

• 3

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How many valence electrons are in a sulfur atom (atomic #16)?

• 2

• 6

• 8

• 16

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The correct noble gas notation for Osmium (Os) is:

• [Xe] 6s²5d⁶

• [Xe] 6s²4f¹⁴5d⁶

• [Kr] 5s²4d¹⁰6s²5d⁶

• [Kr] 5s²4d¹⁰6s²4f¹⁴5d⁶

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Which of the three major subatomic particles play the most important role in determining the physical and chemical properties of an element?

• electron

• neutron

• proton

• they are all important

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The horizontal rows on the periodic table are called the:

• families

• groups

• periods

• families and groups

Vertical columns on the periodic table are called:

• families

• groups

• periods

• families and groups

The period where an element is located tells us:

• the number of energy levels

• the number of valence electrons

• the number of energy levels and valence electrons

• none of the above

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