B. Vocabulary Part 1: Read the Chinese vocabulary and match the correct pinyin.  记得； 記得[b1] 旅行[b2] 干净；乾净[b3] 安静[b4] 家具； 家俱[b5] 附近[b6] 印象[b7] 整理[b8] 宠物；寵物[b9] 搬[b10]   a) yìnxiàng b) jìdé c) bān d) lǚxíng e) gānjìng f) chǒngwù g) zhěnglǐ h) ānjìng i) jiājù j) fùjìn  

The half-life of 86Ra is 1.2 minutes.  How much time will it take for the radioactivity of this radioisotope to be decreased to 50% of its original intensity?

A valence number of +1 indicates which of the following? One electron in the valence shell The atom will be likely to give up its valence electron/s, thus making a good conductor Seven electrons in the valence shell

Which of the following types of radiation carries one unit of negative electrical charge?

The octet rule states that the outermost shell of an electron cannot exceed ____ electrons.

Which atomic model described the atom as a miniature solar system with electrons revolving in prescribed orbits?

Which of the following is/are true in regards to centripetal force? It is also referred to as the “center-seeking force”. It describes the electrostatic force of attraction between the positively charged nucleus and the negatively charged electron that keeps the electron in its orbit. It is the tendency of a rotating body to move away from the center of rotation.

Which of the following conversions is correct in expressing exposure?

The atomic particle that has a weight of 1 AMU and carries no charge is called a/an:

How much radioactivity would be left after 9 hours for a sample of 13C if the half-life of this radioisotope is 3 hours?