Activity1: Tracking the path and constructing the periodic table

How many groups of elements were formed?

• 7 Groups

• 8 Groups

• 9 Groups

What Criteria did you use to choose which group an element belongs to?

• The element's color and state of matter.

• The properties of the element and the compounds it forms.

• The element's date of discovery.

Are there any exception/s to these trends? If so, which elements break the trend? Why did your group arrange these elements the way you did?

• No, all elements perfectly followed the established trends of the table.

• Yes, hydrogen is an exception because it's a gas, but it was placed based on its atomic mass.

• Yes, iodine and tellurium are exceptions. Their properties are quite dissimilar to other elements in their respective groups, despite their placement.

Are there any gaps in your arrangement of elements? Where are they, and what might these gaps signify?

• Yes, there are gaps, but they are randomly distributed and have no particular meaning.

• Yes, there are gaps only in the noble gas family, indicating elements that are difficult to isolate.

• Yes, there are gaps in the families of boron/aluminum and carbon/silicon, possibly indicating undiscovered elements during Meyer's and Mendeleev's time.

How did your table of elements change each time you added new elements?

• The table remained exactly the same; new elements were simply listed separately.

• Gaps were filled with newly discovered elements, and a new family was created for the noble gases.

• The table was reorganized based on color, and the element names were changed.

How is the table of elements you prepared similar to the modern periodic table? How is it different?

• It's identical to the modern periodic table in every way.

• It's completely different; there are no similarities to the modern periodic table.

• It's similar in that elements are grouped by families, but it's organized by atomic mass, stops at xenon, and doesn't include transition elements.

How do you explain the fact that tellurium comes before iodine in the modern periodic table, though it has a higher atomic mass than iodine?

• It's a mistake in the modern periodic table; tellurium should come after iodine.

• The modern periodic table is organized randomly, so the order doesn't have a specific meaning.

• The modern periodic table is organized by atomic number, and iodine has a higher atomic number than tellurium.

Mendeleev predicted the existence of gallium and germanium because of the gaps in his table. Why do you think Mendeleev did not predict the existence of the noble gases?

• The noble gases were already discovered, so there was no need to predict them.

• Mendeleev did not know about any member of the noble gas family, so he didn't have an inkling that others might also exist.

• Mendeleev only focused on predicting elements with low atomic masses.

Refer to the modern periodic table. Suppose 2 new elements were discovered with atomic numbers 120 and 121. Where in the Periodic table do you think you would place these new elements?

• Element 120 would be placed above hydrogen, and element 121 would be placed above lithium.

• Element 120 would be placed below radium, and element 121 would be placed below actinium.

• Element 120 and 121 would both be placed in a completely new row at the bottom of the table.

Suppose a new element X is known. It forms a compound with chlorine, and the formula of this compound is XCl4. What group or family do you think this element would belong?

• The halogen family (Group 17).

• The group or family of carbon, silicon, and germanium.

• The noble gas family (Group 18).