1. 2.
Which of the following has maximum atomic size? (a) K (b) Ca (c) Al (d) P The law of octaves was proposed by (a) Newland (b) Doberiener (c) Lother Meyer (d) Mendleeve The number of periods in the long form of the periodic table is (a) 6 (b) 7 (c) 10 (d) 18 Which of the following elements has maximum metallic character? (a) Li (b) N (c) Na (d) P Which of the following is the most reactive halogen? (a) F (b) Cl (c) Br (d) I Why do elements in a group show same valency? Why are the members of group 1 known as alkali metals? How does metallic character of the elements vary (i) In a group (ii) In a period? Name the other elements which belong to the same family as (i) Calcium (ii) Carbon. How would tendency to gain electrons change as you go down in a group? Two elements X and Y belong to Group 1 and Group 2 respectively in the same period. Compare them with respect to: (a) The number of valence electrons (b) Valency (c) metallic character (d) Size of the atoms (e) Formula of their oxides and chlorides. The following table shows the position of six elements A, B, C, D, E and F in the period table.
Groups Periods 2 3 1 2 A D E 3 to 12 13 14 15 16 B 17 18 C F
(1) (1)
3. 4. 5. 6. 7. 8. 9. 10. 11.
(1) (1) (1) (2) (2) (2) (2) (3) (3)
12.
(3)
Using the table answer the following (a) Which element will form only covalent compounds? (b) Which element is a metal with valency 2. (c) Which clement is a non-metal with valency 3. (d) Out of D and E which has bigger atomic radius and why? (e) Write a common name for the family of elements C and F
Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks
You May Also Find These Documents Helpful
-
Si 2. B 3. H 4. N 023 10.0 points Elements in a group (column) of the periodic table have similar chemical properties because 1. their valence electrons are all located in the same physical shell.…
- 1541 Words
- 14 Pages
Good Essays -
The periodic table is composed of eighteen columns and seven horizontal rows, with two additional rows underneath. There is grand total of 112 elements in the periodic table, each of which is placed in a designated spot on the table and cannot be moved. Different areas on the table have elements that are made of different components. Elements that are in the same column are more similar than elements in the same horizontal row. Seventy five percent of the table is made up of metals, and a couple of the columns on the right of the table have gases. There are only two elements that are liquids- mercury and bromine. Column 1 contains the alkali metals, which suddenly combust when exposed to air or water. Columns 3-12 are the transition metals, which contain heavier atoms, which are more flexible in how they organize their electrons. Column 17 is made up of the more reactive gases- the halogens. The noble gases are in column 18. The electrons are the most significant part of an atom. When atoms don’t have the sufficient number of electrons they need in their outer level, they will do whatever they can to get the number they need. The number of protons an atom has is its atomic number. The atomic number plus the number of neutrons the atom has is the atom’s atomic weight.…
- 575 Words
- 2 Pages
Good Essays -
2. Examine John Newland’s periodic table developed in 1864 (http://chemistry.tutorvista.com/inorganic-chemistry/law-of-octaves.html) to answer the following question.…
- 465 Words
- 2 Pages
Satisfactory Essays -
7. The mass of the most common isotope of each element is listed on the periodic table.…
- 7450 Words
- 30 Pages
Good Essays -
(D) 3. In which compound do all atoms have the same electronic configuration? (A) (B) (C) (D) 4.…
- 835 Words
- 4 Pages
Good Essays -
III. Pre-Lab Questions- What are the group 1 elements called, they are called alkali metals. List the group one elements, Hydrogen, Lithium, Sodium, potassium, Rubidium, Cesium, and Francium. How many valence electrons does group 1 have, group 1 has 1 valence electron. When group one elements become ions what are is their charge, their charge is +1. What are the group 2 elements called, they are called the alkali earth metals. List the group 2 elements, the group 2 elements are Beryllium, Manganese, Calcium, Strontium, Barium, and Radon. How many valence electrons does group two have, group two has 2 valence electrons. When group two elements become ions what is their charge, their charge is +2. What are the group 17 elements called, they are called the Halogens. List the group 17 elements, Fluorine, Chlorine, Bromine, Iodine, and Astatine. How many valence…
- 404 Words
- 2 Pages
Satisfactory Essays -
2. Refer to the periodic table of elements (Figure 30 in your study unit) to help you answer…
- 565 Words
- 3 Pages
Good Essays -
A periodic table that has the atomic number, atomic radius (AR), and first ionization energy (IE) was given out by the teacher.…
- 2332 Words
- 10 Pages
Good Essays -
5. The number of protons in one atom of an element determines the atom’s _____________, and the number of electrons determines the ________________ of the element. 6. The atomic number tells you the number of ____________ in one atom of an element. It also tells you the number of ____________ in a neutral atom of that element. The atomic number gives the “identity” of an element as well as its location on the periodic table. 7. No two different elements will have the ____________________. What is a valence electron? _____________________________________…
- 538 Words
- 3 Pages
Satisfactory Essays -
Look up the elements in group 2 from period 2 - 5, give the name and symbol of each. Give information about how each is commonly found in NATURE (if you were walking down the street and picked some off the ground, in what form would it be? Would you have to be walking in a certain part of the world?)…
- 425 Words
- 2 Pages
Satisfactory Essays -
Class 1 to Class 12 Lessons, Animations, Videos & more… Math, EVS, Science, English, SST… www.MeritNation.com/CBSE…
- 886 Words
- 4 Pages
Good Essays -
The Medical Council of India (MCI) recommended the following syllabus for National Eligibility-cum-Entrance Test for admission to…
- 5279 Words
- 22 Pages
Better Essays -
The discoveries of elements stole a long period of time. As a matter of fact, several elements were mentioned in Biblical accounts and Koran. However, it was in the 19th century where they get to discover a lot of element. And as the number of elements grew in number, so does the interest of the scientists in developing its techniques.…
- 2191 Words
- 9 Pages
Better Essays -
429768018669000The periodic table is ordered into periods and groups. A row of elements across the periodic table is calleda a period. Each period has a number, from 1 till 7. Period 1 only has 2 elements in it: Hydrogen and helium. Period 2 and 3 both have 8 lements. Other periods are usually longer. A colomn of elements down the table is called a group. There are 18 groups in the periodic table. Each group has a number from 1 till 18. Elements in a group are usually catorized so because they all have electrons arranged in smimilar ways. They behave in 434848049657000similar ways. For example, group 18(the last group) is known as noble gases because they are all gases and they do not combine with other atoms. This way, the periodic table is ordered and chemists can use it to observe patterns, and also relationships between the elements. The periodic table at the far left are the most metallic ones, and elements on the top right are the least metallic. A metallic element is for example cesium, and helium is much less metallic. They are also more patterns and relationships between the arrangements of the periodic table.…
- 1323 Words
- 4 Pages
Powerful Essays -
HOLIDAY – HOMEWORK (2013-2014) CLASS-X ENGLISH Section- A: BBC: Reading Comprehension: Ex.1, 2 & 3. Section- B: BBC: Writing Skills: E-mail 1 & 2; Letter writing 1 & 2; Speech 1 & 2; Article 1& 2. Section- C: BBC: Grammar: Preposition, Voice, Speech, Tenses. Section- D: 1. Value based: Which poem do you appreciate the most – ‘The frog and the nightingale’ or ‘Mirror’? Why? Write the literary devices used in that poem. Write about the poet. (150 words) 2. Extrapolatory: Imagine that you are Miss Mebbin (Mrs Packletide’s Tiger). How you would have blackmailed Mrs. Packletide and for what? How you would you have managed to get something of your choice? (200 words) 3. Novel based: Diary of a young girl: Write a book review on the basis of your reading of chapter 1 to 10. (Name of the novel, author, protagonist, theme, and summary) 4. Declamation: Write your views on the topic – ‘Luck favours those who dare’. (250 words) Note: Write on ruled sheets. Use blue/black gel pen only. Only hand written assignments will be accepted. Write neatly. HINDI…
- 2285 Words
- 10 Pages
Good Essays