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12 Cards in this Set

  • Front
  • Back
What is the law of Octaves?
When elements were arranged by atomic mass every 8th element had similar properties. This law was adequate up to 20 elements but did not hold up part 20 (Ca).
Mendeleev's periodic table?
Grouped elements more accurately
Made possible the prediction of the properties of several elements that had not yet been discovered.
What were some problems with the early periodic table?
Argon has a larger atomic mass than potassium which could not really be explained
This was explained when atomic number was discovered
What does the modern periodic table show?
Shows atomic number and element symbol
The electron configurations of elements help explain the recurrence of physical and chemical properties
Why is the periodic table important?
Important because helps us understand general properties and trends within a group or period
Also helps to predict properties of any element even if we are not familiar with the element
What is classification of elements based on?
Filling of outer shell of electrons. Outer shell of electrons are called valence electrons.
Why do elements of the same groups behave similarly?
The reason for this is they all have the same number of electrons in their outer shell
What area noble gases?
Behave similary. Mostly inert, this is due to the completely filled ns and np subshells
Transition elements classification?
No regualar pattern of electron configuration. All transition metals share some characteristics.
How do Lanthanides and actinides behave?
Why do we always use metal's empirical formula in chemical equations?
Because metals and metalloids do not exist as distinct molecular units
How are nonmatals represented in chemical equations?
No single rule
Carbon exists in extensive networks; so we use its empirical formula
For the most part we use stable forms of the element to represent it
Noble gases are monoatomic and thus represented by their empirical formula