「元素記号（名前）」コース
問題
Warning: Undefined variable $d_question_sentence in /home/heartfultrust/takuitsu.com/public_html/question.php on line 78
元素記号の名前は何か。
Fatal error: Uncaught TypeError: shuffle(): Argument #1 ($array) must be of type array, null given in /home/heartfultrust/takuitsu.com/public_html/question.php:80 Stack trace: #0 /home/heartfultrust/takuitsu.com/public_html/question.php(80): shuffle(NULL) #1 {main} thrown in /home/heartfultrust/takuitsu.com/public_html/question.php on line 80