Understanding Periodic Table Periods

The Modern Periodic Table arranges elements based on their atomic number and recurring chemical properties. It consists of horizontal rows called periods and vertical columns called groups. The period number indicates the highest principal energy level occupied by electrons in an atom of that element.

The question asks us to identify the element that does NOT belong to Period 6 from the given options: Silicon, Tungsten, Rhenium, and Platinum.

Analyzing the Elements and Their Periods

To answer this question, we need to locate each element in the Modern Periodic Table and determine its period number.

• Silicon (Si): Silicon has an atomic number of 14. It is located in Group 14. Looking at the periodic table, Silicon is in the third row. Therefore, Silicon is in Period 3.
• Tungsten (W): Tungsten has an atomic number of 74. It is a transition metal located in Group 6. Tungsten is found in the sixth row of the periodic table. Therefore, Tungsten is in Period 6.
• Rhenium (Re): Rhenium has an atomic number of 75. It is a transition metal located in Group 7. Rhenium is also found in the sixth row of the periodic table, immediately following Tungsten. Therefore, Rhenium is in Period 6.
• Platinum (Pt): Platinum has an atomic number of 78. It is a transition metal located in Group 10. Platinum is found in the sixth row of the periodic table. Therefore, Platinum is in Period 6.

Comparing the Periods

Now let's compare the periods of the given elements:

From the table, it is clear that Tungsten, Rhenium, and Platinum are all located in Period 6. Silicon, on the other hand, is located in Period 3.

Conclusion

The element that does NOT belong to Period 6 of the Modern Periodic Table is Silicon, as it is located in Period 3.

Revision Table: Elements and Periods

Additional Information: The Modern Periodic Table Structure

The Modern Periodic Table is organized into seven periods (rows) and eighteen groups (columns). The period number corresponds to the highest principal quantum number (n) of the valence electrons for elements in that period. For instance, elements in Period 1 have their valence electrons in the n=1 shell, elements in Period 2 in the n=2 shell, and so on, up to Period 7 where valence electrons are in the n=7 shell.

Period 6 is particularly long, starting with Cesium (Cs, Z=55) and Barium (Ba, Z=56), followed by the Lanthanides (from Lanthanum, La, Z=57, through Lutetium, Lu, Z=71 - these are usually shown in a separate block below the main table but belong to Period 6), and then continuing with Hafnium (Hf, Z=72) across to Radon (Rn, Z=86).

Elements in Period 6 include many well-known transition metals, including Tungsten, Rhenium, and Platinum, as well as the Lanthanides.

Silicon is a nonmetal (metalloid) found in Period 3 and Group 14, along with Carbon, Germanium, Tin, and Lead.