Periodic table: Difference between revisions

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 ,14,232,40,101,Md,Mendelevio,258,0,0,0,0,635.0,1.30,[Rn]5f¹³7s²,+3+2
 ,15,232,40,102,No,Nobelio,259,0,0,0,0,642.0,1.30,[Rn]5f¹⁴7s²,+3+2
+</pre>
+=={{header|C++}}==
+<syntaxhighlight lang="c++">
+#include <cstdint>
+#include <iomanip>
+#include <iostream>
+#include <stdexcept>
+#include <vector>
+struct Group {
+	int32_t first;
+	int32_t last;
+};
+struct Position{
+	int32_t period;
+	int32_t group;
+};
+const std::vector<Group> GROUPS = { Group(3, 10), Group(11, 18),
+	Group(19, 36), Group(37, 54), Group(55, 86), Group(87, 118) };
+Position periodic_table(const int32_t& atomic_number) {
+	if ( atomic_number < 1 || atomic_number > 118 ) {
+		throw std::invalid_argument("Atomic number is out of range:" + atomic_number);
+	}
+	if ( atomic_number == 1 ) { // Hydrogen
+		return Position(1, 1);
+	}
+	if ( atomic_number == 2 ) { // Helium
+		return Position(1, 18);
+	}
+	if ( atomic_number >= 57 && atomic_number <= 71 ) { // Lanthanides
+		return Position(8, atomic_number - 53);
+	}
+	if ( atomic_number >= 89 && atomic_number <= 103 ) { // Actinides
+		return Position(9, atomic_number - 85);
+	}
+	int32_t period = 0;
+	int32_t periodFirst = 0;
+	int32_t periodLast = 0;
+	for ( uint64_t i = 0; i < GROUPS.size() && period == 0; ++i ) {
+		Group group = GROUPS[i];
+		if ( atomic_number >= group.first && atomic_number <= group.last ) {
+			period = i + 2;
+			periodFirst = group.first;
+			periodLast = group.last;
+		}
+	}
+	if ( atomic_number < periodFirst + 2 || period == 4 || period == 5 ) {
+		return Position(period, atomic_number - periodFirst + 1);
+	}
+	return Position(period, atomic_number - periodLast + 18);
+}
+int main() {
+	for ( int32_t atomic_number : { 1, 2, 29, 42, 57, 58, 59, 71, 72, 89, 90, 103, 113 } ) {
+		Position position = periodic_table(atomic_number);
+		std::cout << "Atomic number " << std::left << std::setw(3) << atomic_number
+                  << " -> " << position.period << ", " << position.group << std::endl;
+	}
+}
+</syntaxhighlight>
+{{ out }}
+<pre>
+Atomic number 1   -> 1, 1
+Atomic number 2   -> 1, 18
+Atomic number 29  -> 4, 11
+Atomic number 42  -> 5, 6
+Atomic number 57  -> 8, 4
+Atomic number 58  -> 8, 5
+Atomic number 59  -> 8, 6
+Atomic number 71  -> 8, 18
+Atomic number 72  -> 6, 4
+Atomic number 89  -> 9, 4
+Atomic number 90  -> 9, 5
+Atomic number 103 -> 9, 18
+Atomic number 113 -> 7, 13
 </pre>