Timeline of Periodic Table

Timeline of Periodic Table

Multiple Select

Choose all elements with only one letter as symbol.

• Helium

• Hydrogen

• Nitrogen

• Oxygen

• Calcium

The elements that Aristotle chose were Earth, Water, Fire, and Air.

Multiple Select

Aristotle classified elements as

• Land

• Earth

• Water

• Fire

• Air

In search of the Philosopher's Stone, or an object that would turn any ordinary metal into gold, Brand found a glowing white rock

1649, Hennig Brand

2019, 350th Phosphorus year

Multiple Choice

What did Hennig Brand discover as glowing white rock?

• Neon

• Platinum

• Phosphorus

• Nitrogen

dicoveries during and before the Age of Enlightenment.

Before 1800 (36 elements)

Multiple Choice

Copper is one of the first elements discovered. What is its symbol?

• C

• Ca

• Co

• Cu

impulse from Scientific Revolution and Atomic theory and Industrial Revolution.

1800-1849 (+22 elements)

the age of Classifying Elements received an impulse from the Spectrum analysis.

1850-1899 (+23 elements)

Arranging elements in OCTAVES

John Newlands, 1865

arrange the chemical elements in order of atomic weights

1862, Alexandre-Emile Beguyer

1869, Dmitri Mendeleev

2019, 150th year of Periodic Table

Mendeleev ordered the elements by atomic weights (molar masses)

When the elements were ordered by their atomic weights, they exhibited similar chemical properties.

impulse from the old quantum theory, the Refinements to the periodic table, and quantum mechanics.

1900-1949 (+13 elements)

1885-1890 he published several notable papers on the oxides of N & followed those up with the discovery of Ar, He, Ne, Kr, & Xe.

Sir William Ramsay

Multiple Choice

Ar, He, Ne, Kr, & Xe are important gases that were not considered in the periodic table designed by Mendeleev. What do you call these gases?

• crucial gases

• critical gases

• notable gases

• noble gases

changed the order around of Mendeleev's table to be organized by atomic number

Henry Moseley

Multiple Choice

Atomic number is the element's number of:

• electron

• neutron

• proton

• nucleus

Manhattan_Project and Particle physics issues, for atomic numbers 97 and above

1950-1999 (+15 elements)

code name for the American-led effort to develop a functional atomic weapon during World War II

1945, Manhattan Project

discovered a lot of radioactive elements

Multiple Choice

Plutonium is one of the radioactive elements discovered during Manhattan Project era. What is the symbol of it?

• P

• Pl

• Pt

• Pu

change to the table in the form of an addition of the actinide and lanthanide series at the bottom of the table

Glenn T. Seaborg

Timeline of chemical element discoveries

https://en.wikipedia.org/wiki/Timeline_of_chemical_element_discoveries