#ifndef OXYGEN_ATOM_H
#define OXYGEN_ATOM_H
#include <cstddef>   //for size_t

class oxygen_atom {
private:
	static const size_t z {8}; //atomic number
	int electrons[z];
	int protons[z];
public:
	oxygen_atom() {}

	static int period() {   //which row of the periodic table?
                int p {1};
                for (; z > 2 * p * p; ++p) {
                }
                return p;
        }
};

#endif