WorksheetsChem 5.1 Part 2 The Periodic Table of the Elements
Total questions: 7
Worksheet time: 4mins
What was the main idea behind Dobereiner’s Triads in the development of the periodic table?
Elements were arranged by increasing atomic number.
Elements were grouped in threes with similar properties.
Elements were organized by their chemical reactivity.
Elements were arranged by their electron configurations.
Which of the following elements is part of Dobereiner’s Triads?
Helium
Bromine
Neon
Argon
How did Newlands contribute to the development of the periodic table?
By arranging elements in order of increasing atomic number.
By proposing the law of octaves, where every eighth element had similar properties.
By discovering the noble gases.
By predicting the existence of undiscovered elements.
What was a significant feature of Mendeleev’s periodic table published in 1869?
It was arranged by increasing atomic number.
It included all known elements without any gaps.
It left spaces for undiscovered elements.
It was organized by electron configurations.
Identify the pattern Mendeleev used to predict the existence of undiscovered elements.
He used the law of octaves.
He observed gaps in the patterns of properties.
He arranged elements by increasing atomic number.
He grouped elements by their electron configurations.
Which of the following elements did Mendeleev predict based on gaps in his periodic table?
Helium
Gallium
Neon
Argon
Explain how Mendeleev’s periodic table differed from Newlands’ Octaves.
Mendeleev arranged elements by increasing atomic number, while Newlands used atomic weight.
Mendeleev left spaces for undiscovered elements, while Newlands did not.
Mendeleev grouped elements by electron configurations, while Newlands used chemical reactivity.
Mendeleev used triads, while Newlands used octaves.
