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Questions and Answers
What is the significance of the middle element in Döbereiner's Law of Triads?
What is the significance of the middle element in Döbereiner's Law of Triads?
- It is always a noble gas.
- It has the highest atomic mass.
- It is the heaviest element of the triad.
- Its atomic mass is the average of the other two elements. (correct)
Which statement best describes Newlands' Law of Octaves?
Which statement best describes Newlands' Law of Octaves?
- It claims that every eighth element shares similar properties. (correct)
- It is based on the periodic law of elemental stability.
- It categorizes elements based on their atomic radii.
- It states that elements can only be arranged by their chemical reactivity.
What did de Chancourtois observe when plotting atomic mass against volume?
What did de Chancourtois observe when plotting atomic mass against volume?
- A lack of correlation among the heavier metals.
- A linear relationship between atomic mass and volume.
- Transition metals consistently showed higher volumes than alkali metals.
- Peaks and troughs indicating specific trends among various groups of elements. (correct)
In Lothar Meyer's atomic volume curves, which group corresponds to the peaks?
In Lothar Meyer's atomic volume curves, which group corresponds to the peaks?
Which characteristic is NOT associated with Lothar Meyer's observations about atomic volume curves?
Which characteristic is NOT associated with Lothar Meyer's observations about atomic volume curves?
Flashcards
Döbereiner's Triads
Döbereiner's Triads
Grouping of 3 elements with similar properties where the middle element's atomic mass is roughly the average of the other two.
Newlands' Law of Octaves
Newlands' Law of Octaves
Elements arranged by increasing atomic mass, where every 8th element has similar properties.
de Chancourtois' Teluric Helix
de Chancourtois' Teluric Helix
A plotted graph showing peaks and troughs relating atomic mass and volume, and classifying elements with similar behaviors.
Lothar Meyer's Atomic Volume Curves
Lothar Meyer's Atomic Volume Curves
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Periodic Trends
Periodic Trends
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Study Notes
Law of Triads
- Döbereiner grouped three elements with similar properties.
- The atomic mass of the middle element is roughly the average of the other two.
- Example: Li, Na, K (7, 23, 39)
Law of Octaves
- Newlands arranged elements in increasing order of atomic mass.
- Every 8th element had similar properties.
- Elements shown similarities in properties: Li, Be, B, C, N, O, F; Na, Mg, Al, Si, P, S, Cl
Teluluric Helix Model
- De Chancourtois plotted a graphic of atomic weight versus elements
- Observed peaks and valleys in the plot relating to element properties
- Peaks related to alkali metals; valleys to earth metals
- Further, peaks related to halogen; minima for heavy/transition metals
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