code: public static Atom scale(Atom a, double s) {
  		double x = a.getX();
  		double y = a.getY();
  		double z = a.getZ();
  
  		Atom b = new AtomImpl();
  		b.setX(x*s);
  		b.setY(y*s);
  		b.setZ(z*s);
  
  		return b;
  	}
docs: Multiply elements of a by s
  
  @param a
  @param s
  @return A new Atom with s*a