Who invented the Periodic Table?

• Mendeleev

• Bohr

• Lewis

• Democritus

Mendeleev's genius was his ability to

• predict elements that were not discovered yet

• organize elements by their mass

• had an element named after himself

• organize elements by properties

who discovered the first scientific and systematic periodic table

• Henry Mosley

• Dmitri Mendeleev

• John Dalton

• sir Isaac Newton

Which one is correct about mendeleev's periodic law

• Properties of elements are periodic function of their atomic mass

• the physical and chemical properties of elements are periodic function of their atomic number.

• physical properties of elements are periodic function of their atomic weight.

• chemical properties of elements are periodic function of their atomic number.

How did Mendeleev arrange the elements?

• alphabetical 
• density
• melting point
• atomic mass

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NGSS.HS-PS1-1

Dimitri found that there was a pattern of properties that repeated every ____ elements.

• 2
• 4
• 5
• 7

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NGSS.HS-PS1-1

The months of the year are __________ because they repeat in the same order every 12 months.

• periodic
• group
• period
• halogens

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NGSS.MS-ESS1-1

The atomic number of this pictured element is

• 28
• 58.6934
• Ni
• Nickel

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NGSS.HS-PS1-1

What is the atomic mass of Neon?

• 10
• 30
• 10.18
• 20.18

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NGSS.HS-PS1-1

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