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

class helium_atom {
private:
	static const int z {2}; //atomic number
	int electrons[z];
	int protons[z];
public:
	helium_atom() {}

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

#endif