Write the atomic number of element present in the period and group of the periodic table

Question

Write the atomic number of element present in the  period and  group of the periodic table

Canvas Classes · Accepted Answer

Strategy:
 Combine the period and group location to deduce the valence electronic configuration and subsequent atomic number.

Step 1: Interpret location
-  Period: The valence shell is .
-  Group: Halogen group. Valence configuration is .

Step 2: Write total configuration
Substituing :

Total electrons .

Step 3: Verification
Atomic number 17 belongs to Chlorine (Cl), which is indeed the Period 3 halogen.

More questions from Classification of Elements and Periodicity