Atoms and atomic theory
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English-for-Chemistry-1-After-lesson-1
- Điều hướng trang này:
- 1. Passive voice TO BE + V (past participle) 2. Question forms
- Lesson 2. THE PERIODIC TABLE 2.1 Listening: Periods and groups in the periodic table Complete the paragraph by filling the blanks
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Q1. Answer the following questions by using the reading text. 1. What can the atomic number be used to determine? 2. Why don’t all of atoms of a specific element which have the same number of protons necessarily have the same number of neutrons? 3. How can the mass number be calculated? 4. Does an electron carry an atomic unit of negative charge? How much is it? English in chemistry 1 – 2017 TS. Nguyễn Tuyết Phương – TS. Trần Thu Phương 3 5. What is the electric charge of proton in SI system? Q2. - Find sentences in the text containing the passive voice. - Make 5 sentences in the passive voice using content of the text. Q3. - Make groups of students. - Each group prepares 5 questions. - Each group takes turn to ask and answer questions from the other group. Grammar note: 1. Passive voice TO BE + V (past participle) 2. Question forms - Yes-No question - WH question English in chemistry 1 – 2017 TS. Nguyễn Tuyết Phương – TS. Trần Thu Phương 4 Lesson 2. THE PERIODIC TABLE 2.1 Listening: Periods and groups in the periodic table Complete the paragraph by filling the blanks As you move from the light elements to the …(1)… elements, you keep periodically coming across the same properties which are why it’s called the periodic table. The recurring properties are …(2)…, so that you can easily see similarities between elements. The periodic table is arranged in periods and …(3)…, going from the light elements at the top to the heavy elements at the bottom. The rows going across from left to right are …(4)…. Elements in the same period all share something in common. They have the same number of energy …(5)…. Each new period row represents a new shell. Elements in the first period have one shell and as we go down the shells increase. …(6)… is in the first period. It has one shell. Potassium is in the fourth period and has four energy shells as do all the other elements in this period. The columns going down from top to bottom are the groups. Elements in the same group also have something in …(7)…. Elements in the same group have the same number of electrons in the outermost shell. The electrons in the outer shell are called the valence electrons. This just means that these electrons are available for …(8)… and bond formation. The number of electrons in the outer shell governs element reactivity which is why elements in the same group have similar …(9)…. The group number can tell you how many electrons are in this shell, for example, let’s look at group seven, fluorine, chlorine, …(10)…, bromine and astatine. They all have seven electrons in the outermost shell and all exhibit similar chemical characteristics. The properties show a gradual change going down the group as we go from period to period. So if we look at group seven again, we can see that they are each in the different period in the …(11)… table, telling us that each element in this group has its outer electrons on the different shell. So chlorine is in group seven, period three, therefore, it has …(12)… energy levels with seven electrons in its outermost shell. tải về 0.52 Mb. Chia sẻ với bạn bè của bạn:
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