chemistry character with krypton

atmosphere atom atoms attention boiling bonds button chain chemical chemically chemistry chemists constant decay density dwarf electron electrons experiment fertilizers fill gas gases icon incandescent industry inert intermediate ion krypton lamps meaning melting molecule molecules monatomic neutron noble observation operations organic oxidant paint particles periodic pesticide pharmaceuticals phenomenon physical physics plastic plate point production properties property reaction reactions research rule science shell shield sign six structure subareas substances table thirty unknown vector voltage