(D) The chlorophyll molecule consists of a porphyrin ring (a head) and a phytol tail. The porphyrin ring is a tetrapyrrole structure with a central $M

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(D) The chlorophyll molecule consists of a porphyrin ring (a head) and a phytol tail. The porphyrin ring is a tetrapyrrole structure with a central $Mg^{2+}$ ion coordinated to the four nitrogen atoms of the pyrrole rings. Therefore,magnesium $(Mg)$ is the element located at the centre of the porphyrin ring in chlorophyll.