class Atom {

	int getIncomingValency() {
		int v = 0;
		for (int i = 0, l = bonds.size(); i < l; i++) {
			v += bonds.get(i).getOrder();
		}
		return v;
	}

	  Atom(int id, ChemEl chemlEl, Fragment frag);
	  Atom(ChemEl chemlEl);

}