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Electron Configuration and the periodic table true and false questions?

Classify each statement as true or false:

  1. The highest principal quantum number of period 2 element is 2.

  2. Period 4 elements have an inner electron configuration of [Ar]

  3. The valence electrons of groups 5A elements are in the 6s subshell.

  4. Group 8A elements have completely full outer principal shells.

  5. Period 5 elements have an inner electron configuration of [Xe]

  6. The valence electrons of group 2A elements are in an s subshell.

  7. The highest principal quantum number of period 3 element is 4

  8. Period 3 elements have six 2p electrons

Verified Answer :

taskmasters
  1. The highest principal quantum number of period 2 element is 2. 
    False

    2. Period 4 elements have an inner electron configuration of [Ar] 
    True

    3. The valence electrons of groups 5A elements are in the 6s subshell. 
    False

    4. Group 8A elements have completely full outer principal shells. 
    True

    5. Period 5 elements have an inner electron configuration of [Xe] 
    False

    6. The valence electrons of group 2A elements are in an s subshell. 
    True

    7. The highest principal quantum number of period 3 element is 4 
    False

    8. Period 3 elements have six 2p electrons
    True

Answer:

1. The highest principal quantum number of period 2 element is 2. - True

2. Period 4 elements have an inner electron configuration of [Ar] - True

As the last element of the period 3 is argon which can be used to write the electronic configuration of the Period 4 element.

3. The valence electrons of groups 5A elements are in the 6s subshell. - False

4.Group 8A elements have completely full outer principal shells. - True

as 8A elements are the noble gas elements.

5.  Period 5 elements have an inner electron configuration of [Xe] - False

Because they have an inner electron configuration of krypton.

6. The valence electrons of group 2A elements are in an s subshell. - True.

7. The highest principal quantum number of period 3 element is 4 - False.

8. Period 3 elements have six 2p electrons - True