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homologous
Disjoint means they have no elements in common. The union is the set of elements containing all elements from both sets. Since there is no overlap, the union will have 5+7 elements. Therefore the answer is 12.
They are called Metalloids or "Semimetals".
Newland, Moseley, , Dobereiner, Mendeleeff...
They are called the Lanthanide series and the Actinide series as shown in http://www.syvum.com/cgi/online/serve.cgi/squizzes/chem/ptable.html
Dkdk
Equivalent sets are sets with exactly the same number of elements.
equal sets with exactly the same elements and number of elements.equivalent sets with numbers of elements
Equivalent sets are sets with exactly the same number of elements.
no,because if for example :setA "A,B,C" and setB "D,E,F" they do have the same number of elements ,but they don't have the same elements.
SETS
The set of elements that are elements of the two (or more) given sets is called the intersection of the sets.
Two sets are equal if they both contain the same elements.
Two sets are equal when they have the same elements.
The cardinality of finite sets are the number of elements included in them however, union of infinite sets can be different as it includes the matching of two different sets one by one and finding a solution by matching the same amount of elements in those sets.
Finite, countably infinite and uncountably infinite.
Elements can belong to subsets. Subsets can be elements of sets that are called "power sets".