giải thích tại sao a)nguyên tử Na có xu hướng nhường 1 e khi tham gia phản ứng hóa học b)nguyên tử Cl có xu hướng nhận 1 e khi tham gia phản ứng hóa học

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2. Complete the information about Tony and Maureen Wheeler. Use the past simple form of the verb in brackets. In 1972 Tony and Maureen Wheeler (1)......................... (buy) a mini-van for £100 and (2)......................... (leave) England on a journey to Australia. They (3)......................... (travel) through Europe, the Middle East, and Asia. They (4)...................... (live) very cheaply and (5)...................... (not/ spend) much money. "Cheap, independent adventure travel (6)......................... (be) a new idea at that time", Tony says, "and a lot of people (7)......................... (be) interested in our 11,000 mile journey. They (8)......................... (ask) us about the route we (9)......................... (follow), the places we (10)......................... (go) to, the things we (11)......................... (see), and where we (12)......................... (eat). At that time, there (13)......................... (not/ be) any books about budget travel so we (14)......................... (decide) to write one. We (15)......................... (not/ have) a typewriter so Maureen (16)......................... (borrow) one from work. We (17)......................... (work) on the book in the evenings and at weekends." When they (18)...................... (finish) the book, Tony (19)....................... (take) it to bookshops in Sydney. The buyer at one shop really (20)......................... (like) the book and (21)......................... (show) it to his girlfriend, who (22)......................... (be) a journalist for the Sydney Morning Herald. She (23)................ (write) an article about it. Then a TV channel (24)................. (invite) Tony to appear in a program. A lot of people (25)........................ (be) interested in the book and in independent travel. More and more shops (26)................... (begin) to sell the book. It (27)......................... (be) the start of the Lonely Planet publishing company.