Periodic Table History and Structure

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

Which of these was not proposed by John Dalton in 1805?

• All matter is made of atoms
• Atoms are made of protons, neutrons and electrons
• During chemical reactions, atoms rearrange themselves
• The atoms of a particular element are all identical

Tags

NGSS.HS-PS1-7

Who arranged the first periodic table.

• Mosely
• Einstein
• Mendeleev
• Bohr

Mendeleev classified elements based on not only atomic mass but what else?                                                   

• reactivity
• boiling points
• physical properties only 
•  chemical & physical properties

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.

How many elements were discovered during Mendeleev's time?                                           

• 63
• 56
• 101
• 34

Which statement is not a difference between Mendeleev's table and the modern periodic table?

• there are no transition elements Mendeleev's table.
• Elements are arranged according to atomic no. not atomic mass.
• no gaps in the modern periodic table.
• much more than 60 elements in the modern periodic table.

A ___________ is an arrangement of elements in columns

• columns
• rows
• periodic table
• electron shell

Tags

NGSS.HS-PS1-1

Each column in the periodic table is called a 

• period
• group
• cluster
• unit

Particles in an atom's nucleus that are neutral and have no charge are 

• megatrons. 
• electrons.
• neutrons.
• protons. 

Tags

NGSS.HS-PS1-8