Periodic Table of Elements

The goals of Alchemists during the middles ages. Choose all that may apply.

• Turn elements into precious stones

• Create the philosopher's stone

• Collect and sell gold

• Discover the elixir of life

Write the chemical symbol for the element Antinomy.

He presented the classification of substances into 'four' element groups: acid-making, gas-like, metallic and earthy elements.

• Johann Dobereiner

• Antoine Lavoisier

• John Newlands

• Henery Mosely

Indicate the chemical symbol for the element Lead.

In 1865, John Newlands presented a list of 62 elements where he arranged them by increasing atomic mass. He noticed that properties reemerge after 8 elements. This was called the ____________.

• Law of Octaves

• Law of Triads

• Modern Periodic Table

• Manhattan Project

He attempted to classify the existing elements into groups of three with related properties. He called the group triads.

• Antoine Lavoisier

• John Newlands

• Johann Dobereiner

• Henery Mosely

He organized these elements into rows and groups based on their properties, the atomic weight. He is also known as the Father of Periodic Table.

• Henery Mosely

• John Newlands

• Johann Dobereiner

• Dmitri Mendeleev

He presented the new sequence of the periodic table based on atomic number instead of atomic weight.

• John Newlands

• Henery Moseley

• Glenn Seaborg

• Dmitri Mendeleev

Seaborg took out two groups of elements on the original body of the periodic table to show their properties. What are these two groups?

• Noble Gas

• Lantinides

• Actinides

• Halogens

The U.S. used a nuclear weapon to Nagasaki which they named "Little Boy". It contains what radioactive element?

• Polonium

• Radium

• Uranium

• Plutonium