★ Must-know
Further detail
1. What characterized Döbereiner's Triads?
2. What pattern did Newlands' Law of Octaves identify when elements were arranged by increasing atomic mass?
3. Which principle formed the basis of Mendeleev's original periodic classification?
What were Döbereiner's Triads proposed in 1829?
Groups of three elements with similar chemical properties and middle atomic mass as the mean of the other two.
What did Newlands' Law of Octaves state in 1866?
Certain properties repeated every eighth element when arranged by increasing atomic mass.
How did Mendeleev arrange elements in his periodic classification?
By increasing atomic mass.
What periodic function did Mendeleev state for elements' properties?
Physical and chemical properties were periodic functions of atomic masses.
Which new elements did Mendeleev predict?
Scandium, gallium, and germanium.
How did Mendeleev's work help the study of elements?
It enabled systematic study and helped correct some atomic masses.
It covers the core concepts of Periodic Properties, organized by topic with the key definitions, explanations and takeaways, so it's easier to learn and remember.
Read the full study guide →The practice quiz has 28 multiple-choice questions, each with an explanation. Use it to check what you know and find your gaps.
Take the quiz (28 questions) →There are 61 flashcards on Periodic Properties, with a question on the front and the answer on the back. Try to recall each answer before you flip, and let spaced repetition bring back the ones you miss.
See all 61 flashcards →Upload a PDF or paste your notes. Revizly writes a study guide, a practice quiz and flashcards in about a minute.