Exploring Mendeleev's Periodic Table

Who is credited with creating the first widely accepted periodic table of elements?

• John Dalton

• Dmitri Mendeleev

• Henry Moseley

• Antoine Lavoisier

According to Mendeleev's periodic law, the properties of elements are a periodic function of their:

• Atomic number

• Atomic mass

• Density

• Melting point

Which of the following was a major contribution of Mendeleev to chemistry?

• Discovery of the electron

• Prediction of undiscovered elements

• Invention of the spectroscope

• Discovery of noble gases

How did Mendeleev arrange the elements in his periodic table?

• In order of increasing atomic number

• In order of increasing atomic mass

• In alphabetical order

• In order of increasing density

Which of the following is a limitation of Mendeleev's periodic table?

• It could not explain the position of isotopes

• It included all known elements

• It was based on atomic number

• It grouped elements with similar properties together

What did Mendeleev do when the properties of an element did not fit the pattern in his table?

• He removed the element from the table

• He left a gap for undiscovered elements

• He changed the element’s properties

• He ignored the anomaly

Which element’s discovery later confirmed Mendeleev’s prediction and validated his periodic table?

• Helium

• Gallium

• Neon

• Argon

In Mendeleev’s periodic table, elements in the same vertical column (group) had:

• The same atomic mass

• Similar chemical properties

• The same number of protons

• The same physical state

During which century did Mendeleev develop his periodic table?

• 16th century

• 17th century

• 18th century

• 19th century

Which of the following best describes the historical context in which Mendeleev developed his periodic table?

• All elements were already discovered and classified

• The structure of the atom was well understood

• Many elements were unknown and their properties were not fully understood

• The periodic table was already in use