The substances which are not found in the periodic table are called ?

undiscovered elements (by their atomic number).

(I don't know if this is the correct answer)

Explanation:

The letters “J” and “Q” are the only two letters not found on the periodic table. These letters do not occur in either element symbols or element names.

it was spontaneous.

"ain't i a woman? " is the name given to a speech, delivered extemporaneously, by sojourner truth, (1797–1883), born into slavery in new york state.sojourner truth' delivered her famous speech "ain't i a woman? " (which did not have a title at that moment) was given without any previous preparation. her dissertation took place at the women's convention in akron, ohio, in 1851.