The HasElement( descriptor ) command returns true if descriptor is the name or symbol of an element, or the isotope syntax of an isotope in the ScientificConstants package. Otherwise, it returns false.

Note that if descriptor is an isotope syntax with mass number less than atomic number, the isotope syntax is invalid and an error is returned.

For a description of the isotope syntax, see Element.

$\mathrm{with}\left(\mathrm{ScientificConstants}\right)\:$

$\mathrm{HasElement}\left(\mathrm{Fe}\right)$

$\mathrm{true}$

$\mathrm{HasElement}\left(\mathrm{Fi}\right)$

$\mathrm{false}$

$\mathrm{HasElement}\left(\mathrm{ytterbium}\right)$

$\mathrm{true}$

$\mathrm{HasElement}\left(114\right)$

$\mathrm{true}$

$\mathrm{HasElement}\left(C\left[14\right]\right)$

$\mathrm{true}$

$\mathrm{HasElement}\left(\left[101\,256\right]\right)$

$\mathrm{true}$

$\mathrm{HasElement}\left(H\left[7\right]\right)$

$\mathrm{false}$