Calcium
Iron.
calcium
Periodical chart
about 106 are on a periodic table for the very time being
Because it is an element.
Na is an element found on the periodical table. It is the chemical symbol for Sodium.
Dmitri Mendeleev
it is 56 because you round it of and it used to be 55.85
Ca stands for calcium on the periodic table for the first 2 letters of calcium.
Need CA tax Table 2010
Sulphur/ Sulfur --> S (in capital letter) in the periodic table
For halogens this is the only way to react as oxidant.