Data update

Task/Periodic-table/JavaScript/periodic-table.js

@@ -0,0 +1,24 @@
+// Periodic table
+
+class PeriodicTable {
+  constructor() {
+    this.aArray = [1, 2, 5, 13, 57, 72, 89, 104];
+    this.bArray = [-1, 15, 25, 35, 72, 21, 58, 7];
+  }
+
+  rowAndColumn(n) {
+    var i = 7;
+    while (this.aArray[i] > n)
+      i--;
+    var m = n + this.bArray[i];
+    return [Math.floor(m / 18) + 1, m % 18 + 1];
+  }
+}
+
+pt = new PeriodicTable();
+// Example elements (atomic numbers).
+for (var n of [1, 2, 29, 42, 57, 58, 72, 89, 90, 103]) {
+  [r, c] = pt.rowAndColumn(n);
+  console.log(n.toString().padStart(3, ' ') + " ->" +
+              r.toString().padStart(2, ' ') + c.toString().padStart(3, ' '));
+}