History of Periodic Table

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Who arranged the periodic table by increasing atomic number?

• Mendeleev
• Rutherford
• Bohr
• Mosely

Why were there blank spaces left in Mendeleev's periodic table?                                              

• He didn't know what to put there.
•  Undiscovered elements not yet known.
• Multiple elements could have fit
• He forgot to add the elements in.

Used the law of triads to make a list of elements

• Mendeleev
• Dobereiner
• Mosely

Who was known as the father of the periodic table?

• John Newland

• Dimitri Mendeleev

• Antoine Lavoisier

• Johaan Dobereiner

_______________ developed the first periodic table and arranged the elements in order of increasing atomic mass.

• Stevie Wonder
• Sasha Vujacic
• Dmitri Mendeleev
• James Mosely

What property did Mendeleev use to organize his first periodic table?

• atomic number

• atomic mass

• alphabetical order

• chemical properties

Moseley discovered that the ________ was the most fundamental property needed for organization.

• atomic mass

• mass number

• atomic number

• number of neutron

2.Law of octaves was given by

• a.Meyer

• b.Mendeleev

• c.Newland

• d.Mosley

What was Dmitri Mendeleev's greatest contribution to the history of the periodic table?

• He arranged all of the known elements by their atomic number
• He realised that there was a pattern of reactivity which repeated every 8 elements
• He predicted the existence (and properties) of new elements
• He identified the "law of triads" which became the groups