La tabla periódica de Mendeleev.

The video explores the periodic table's development, from its historical roots with Mendeleev to modern versions that predict undiscovered elements. It discusses the challenges in classifying elements like hydrogen and helium and presents alternative periodic table versions. The video also delves into the future of element discovery, considering the potential stability of new elements and the possible limits of atomic nuclei.

Who is credited with presenting the first widely recognized periodic table?

• John Newlands

• Dmitri Mendeleev

• Henry Moseley

• Lothar Meyer

Why are lanthanides and actinides placed separately in the periodic table?

• They are not naturally occurring elements.

• They have the same atomic number.

• They do not fit on a standard textbook page.

• They have unique chemical properties.

Which version of the periodic table organizes elements in a spiral with hydrogen at the center?

• Benji's version

• Mendeleev's version

• Janet's version

• Newlands' version

What is the predicted characteristic of the element with 126 protons?

• It will be especially stable.

• It will be highly reactive.

• It will be a noble gas.

• It will have a low atomic mass.

What is the speculated limit on the size of atomic nuclei in terms of protons?

• 128 protons

• All of the above

• 137 protons

• 155 protons