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  2. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    The Roman numerals used correspond to the last digit of today's naming convention (e.g. the group 4 elements were group IVB, and the group 14 elements were group IVA). In Europe , the lettering was similar, except that "A" was used for groups 1 through 7, and "B" was used for groups 11 through 17.

  3. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).

  4. List of elements by atomic properties - Wikipedia

    en.wikipedia.org/wiki/List_of_elements_by_atomic...

    This is a list of chemical elements and their atomic properties, ordered by atomic number (Z).. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.

  5. Atomicity (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Atomicity_(chemistry)

    The exact atomicity of metals, as well as some other elements such as carbon, cannot be determined because they consist of a large and indefinite number of atoms bonded together. They are typically designated as having an atomicity of 2. The atomicity of homonuclear molecule can be derived by dividing the molecular weight by the atomic weight.

  6. Fourth grade - Wikipedia

    en.wikipedia.org/wiki/Fourth_grade

    In India, where children enter Class 4 at the ages 9 to 10 it is called Lower Primary, it is known as the fourth grade. 5-7 standard categories as Upper Primary (UP). Lower Primary gives the basic education necessary for a kid and when they get to the UP section, advanced knowledge will be provided via lessons or modules. [citation needed]

  7. Earning Less Than $176,100 Per Year? This Social Security ...

    www.aol.com/earning-less-176-100-per-170000867.html

    A new year brings fresh changes to Social Security. One of the most prominent changes is the cost-of-living adjustment (COLA), which will be 2.5% this year and is slated to boost the average ...

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