periodic table

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

The periodic table is organized by the number of ______ in each element's nucleus

• neutrons
• protons
• electrons
• atoms

Tags

NGSS.HS-PS1-8

Who arranged the first periodic table.

• Mosely
• Einstein
• Mendeleev
• Bohr

Who arranged the first periodic table.

• Mosely
• Einstein
• Mendeleev
• Bohr

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

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

Each column in the periodic table is called a 

• period
• group
• cluster
• unit

In the modern periodic table elements are arranged by:

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