seven different forms of art are there.
seven different forms of art are there.
how many different forms of art are there?
seven
Na
Na
the many different forms of periodic table have prompted the question of whether there is an optimal or definitive form of periodic table. the answer to this question is thought to depend on whether the chemical periodicity seen to occur among the elements has an underlying truth, effectively hard-wired into the universe, or if any such periodicity is instead the product of subjective human interpretation, contingent upon the circumstances, beliefs and predilections of human observers. an objective basis for chemical periodicity would settle the questions about the location of hydrogen and helium, and the composition of group 3. such an underlying truth, if it exists, is thought to have not yet been discovered. in its absence, the many different forms of periodic table can be regarded as variations on the theme of chemical periodicity, each of which explores and emphasizes different aspects, properties, perspectives and relationships of and among the elements.
periodic table