题干

硒是人体必需的一种微量元素,严重缺硒有可能诱发皮肤疾病.已知硒的原子序数为34,质子数与中子数之和为79.下列有关硒原子的说法中,不正确的是(   )

A:核电荷数为79

B:核外电子数为34

C:质子数为34

D:中子数为45

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答案(点此获取答案解析)

A

同类题4

   Jane Austen, a famous English writer, was born at Steventon, Hampshire, on December 16, 1775, and died on July 18, 1817. She began writing early in life, although the prejudices(偏见) of her times forced her to have her books published anonymously (匿名).But Jane Austen is perhaps the best known and best loved of Bath's many famous local people and visitors. She paid two long visits here during the last five years of the eighteenth century and from 1801 to 1806, Bath was her home. Her deep knowledge of the city is fully seen in two of her novels, Northanger Abbey and Persuasion, which are largely set in Bath. The city is still very much as Jane Austen knew it, keeping in its streets and public buildings the well-ordered world that she described so well in her novels. Now the pleasure of learning Jane Austen's Bath can be enhanced (增强)by visiting the Jane Austen Centre in Gay Street. Here, in a Georgian town house in the heart of the city, you can find out more about Bath in Jane Austen's time and the importance of Bath in her life and work.
   The Centre has been set up with the help and guidance of members of the Jane Austen Society. After your visit to the Centre, you can look round the attractive shop, which offers a huge collection of Jane Austen related(相关的) books, cards and many specially designed gifts. Jane Austen quizzes are offered to keep the children busy.
   You can also have walking tours of Jane Austen's Bath, which is a great way to find out more about Jane Austen and discover the wonderful Georgian city of Bath. The tour lasts about one and a half hours. The experienced guides will take you to the places where Jane lived, walked and shopped.