Periodic Table (from class notes)

Who is credited with the first classification system of elements based on atomic masses?

• Mendeleev

• Moseley

• Dobereiner

• Newlands

What term was used to describe the groups of three elements in Dobereiner's classification system?

• Octaves

• Periods

• Triads

• Groups

According to Dobereiner's system, how is the atomic mass of the middle element in a 'triad' related to the other two?

• It is the sum of the atomic masses of the top and bottom elements.

• It is the average of the atomic masses of the top and bottom elements.

• It is unrelated to the atomic masses of the top and bottom elements.

• It is the difference between the atomic masses of the top and bottom elements.

What did John Newlands compare the periodicity of the elements to?

• The steps of a ladder

• The keys of a piano

• The pages of a book

• The strings of a guitar

What was the limitation of John Newlands' Law of Octaves?

• It only applied to gases

• It only applied to elements up to calcium

• It only applied to liquids

• It only applied to synthetic elements

How often did Dmitri Mendeleev notice repeats in properties of elements in the periodic table?

• Every 5 elements

• Every 6 elements

• Every 7 elements

• Every 8 elements

When arranging the elements, why did Dmitri Mendeleev leave spaces in the periodic table?

• For isotopes

• For noble gases

• For unknown elements

• For transition metals

What did Henry Moseley use to determine atomic numbers?

• Chemical reactivity

• X-ray spectra

• Atomic mass

• Electron configuration

How did Henry Moseley arrange the elements in the periodic table?

• By increasing atomic mass

• By increasing molecular size

• By increasing atomic number

• By increasing electron affinity

According to Henry Moseley's work, what are the chemical and physical properties of an element periodic functions of?

• Their electron configurations

• Their atomic masses

• Their isotopes

• Their atomic numbers

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