题目

根据下列表格提供的信息，填入短文中所缺的单词PeopleFatherMotherSisterMarkAge39371612Birthday8.1611.306.213.2JobTeacherDoctorStudentStudent There are people in Mark's family, his parents, his sister and Mark. Mark is a student and he's years old. His birthday is on March second. His is a . He is thirty-nine. His birthday is on 16. His mother is a . She is and she was born (出生) on November 30. Mark's is 16 years old. She is a , too. Her​ is on June 21.（4分）A、B、C、D四种短周期元素，原子序数依次增大，A元素原子最外层电子数是次外层的2倍，0.05 mol B元素的离子得到的6.02×1022个电子后被还原为中性原子；0.4g B的氧化物恰好与100mL 0.2mol/L的盐酸完全反应；B元素原子核内质子数与中子数相等。C离子核外电子层数比A元素的离子核外电子层数多1，且形成离子化合物BC，D与A可形成化合物。请填空：（1）A、B 两种元素的元素符号：B___________ 、C__________。（2）D与A形成化合物分子式是________，分子空间构型是________。