Question

Study the given table carefully and identify P, Q, R, T and U.

• A. P-O ; Q-Mg ; R-Ar ; T-P ; U-Ne​
• B. P-Mg ; Q-O ; R-Ar ; T-P ; U-Ne​
• C. P-O ; Q-Mg ; R-Ne ; T-P ; U-Ar​
• D. P-Mg ; Q-O ; R-Ne ; T-P ; U-Ar​

Answer 1

The correct option is D P-Mg ; Q-O ; R-Ne ; T-P ; U-Ar​

For P:

• Group number = 2, it has 2 valence electrons.
• Period number = 3, it has 3 shells.
• So, the electronic configuration = 2, 8, 2
• The element is Magnesium (Mg).

For Q:

• Group number = 16, it has 6 valence electrons.
• Period number = 2, it has 2 shells.
• So, the electronic configuration = 2, 6
• The element is Oxygen (O).

For R:

• Group number = 18, it has 8 valence electrons.
• Period number = 2, it has 2 shells.
• So, the electronic configuration = 2, 8
• The element is Neon (Ne).

For T:

• Group number = 15, it has 5 valence electrons.
• Period number = 3, it has 3 shells.
• So, the electronic configuration = 2, 8, 5
• The element is Phosphorus (P).

For U:

• Group number = 18, it has 8 valence electrons.
• Period number = 3, it has 3 shells.
• So, the electronic configuration = 2, 8, 8
• The element is Argon (Ar).