Source code:
@Grab(group='org.openscience.cdk', module='cdk-bundle', version='2.9')
import org.openscience.cdk.interfaces.*;
import org.openscience.cdk.*;
import org.openscience.cdk.config.Elements;
IAtom atom = new Atom(Elements.CARBON);
println "Symbol: " + atom.getSymbol()
println "Atomic number: " + atom.getAtomicNumber()
Output:
Symbol: C
Atomic number: 6