Schoolbook Exercises PDF

Schoolbook Exercises  Complete: 1- Mendeleev arranged the elements in an ascending order according to atomic weight while Moseley arranged them in an ascending order according to atomic number 2- The modern periodic table consists of 7 horizontal periods, 16 vertical...

Schoolbook Exercises  Complete: 1- Mendeleev arranged the elements in an ascending order according to atomic weight while Moseley arranged them in an ascending order according to atomic number 2- The modern periodic table consists of 7 horizontal periods, 16 vertical groups.  What is the scientific base (classified according) on which the modern periodic table classified?  the elements are arranged in an ascending order according to atomic number , and the way of filling energy sublevel with electrons  Locate the position of the following elements in the modern periodic table: Element Group period 1 1H 1A 1 2 10Ne Zero or 18 2 3 20Ca 2A 4 4 11Na 1A 3 5 13Al 3A or 13 3 6 18Ar Zero or 18 3  Find the atomic number for the following elements: (1) Element X lies in the first period and zero group 2 (2) Element Y lies in the second period and 3A group 5 (3) Element Z lies in the third period and 7A group 17 Page | 1  Notice the following figure which represents a part of the modern periodic table, then answer the following: X Y Z (1) What are the names of blocks which are characterized by the letter X, Y, and Z? X –S block , y- d block , z – p block (2) What is the number of groups in each block? S block : 2 groups d block : 10 groups p block : 6 groups (3) What is the new number of 7A group and zero group? 7A or 17 , zero group or 18  Study the opposite figure which explains the electronic configuration for an element in the modern periodic table and concludes the atomic number of: (1) the element which follows this element in the same period atomic no. 4+1 = 5 (2) the element which follows this element in the same group atomic no. 4+8 = 12 Page | 2  Worksheet 1 1) CHOOSE THE CORRECT ANSWER: 1. The number of elements in Mendeleev's periodic table is ………………… a. 92 b. 118 c. 76 d. 67 2. The scientist who left empty cells in his table to be filled with discovered elements in future is............. a. Moseley. b. Rutherford. c. Bohr. d. Mendeleev 3. Mendeleev classified the elements of each main group into.......... subgroups a. 2 b. 3 c. 4 d. 5 4. The nucleus of the atom contains ………………… a. positive electrons. b. negative electrons.. c. negative protons. d. positive protons 5. The scientist who discovered that the nucleus of the atom contains positively charge protons is........................... a. Bohr. b. Mendeleev. c. Rutherford. d. Moseley. 2) CHOOSE FROM COLUMN (B) WHAT SUITS IT IN COLUMN (A) (A) (B) 1- Mendeleev a- Added the zero group to the periodic table 2- Rutherford b- Discovered the main energy levels of the atom 3- Moseley c- Corrected the atomic weights of some elements that were estimated wrongly 4- Bohr d- Discovered that the nucleus of the atom contains protons e- Arranged the elements according to the number of neutrons 1) c 2) d 3) a 4) b 3) WRITE THE SCIENTIFIC TERM: 1- The first real periodic table for classifying elements. ( Mendeleev’s periodic table ) 2- Positively charged particles found inside the nucleus of the atom. ( protons ) 3- A table in which the elements are arranged in an ascending order according to their atomic masses. ( Mendeleev’s periodic table ) Page | 3  Worksheet 2 1) CHOOSE FROM COLUMNS (B) AND (C) WHAT SUIT THEM IN COLUMN (A): 1) c , b 2) d , a 3) a , e 4) b , d 2) COMPLETE THE FOLLOWING STATEMENTS : 1- Each main energy level contains a definite number of energy sublevels. 2- Element (13X) is located in period 3 and group ( 3A ) in the modern periodic table. 3- The elements (3X), (11Y), (19Z) are similar in group number, while the elements (3X), (4W), (5D) are similar in period number. 4- The modern number of zero group is 18 while that of group (5A) is 15. 5- In the modern periodic table, elements are arranged according to atomic number and the way of filling energy sublevel with electrons 3) CHOOSE THE ODD SYMBOL OUT, AND THEN WRITE THE SCIENTIFIC TERM OF OTHERS: 1- K / F / L / O / Q (F) , main energy level 2- S / k / d / f / p ( K) , energy sublevels 3- Li3 / C6 / Be4 / Al13 ( Al13 ) , elements of period no. 2 Page | 4 1) A monovalent metallic element is located in the third period in the periodic table ; its nucleus contains 12 neutrons. 1- Calculate: a- Its atomic number 11 b- Its mass number 11+12=23 2- Determine: a- In which block is it located, and its group number? s - block & group 1A (1) 2) Who…? 1- Added the zero group to Mendeleev’s periodic table. ( Moseley ) 2- Discovered that the nucleus of the atom contains positively charged protons. ( Rutherford ) 3) Give reasons for : 1- Both lithium (Li3) and nitrogen (N7) are located in the same period. - Because they are similar in the number of energy levels occupied by electrons ( 2 energy levels). 2- Mendeleev had to make disturbance in the ascending order of atomic weights of some elements. - To put them into groups that suit their properties. 4) Write the number which indicates each of the following : 1- Number of elements in Mendeleev’s periodic table. ( 67 ) 2- Number of known elements in the modern periodic table till now. ( 118 ) 3- Number of elements available in Earth’s crust according to modern periodic table. ( 92 ) 4- Number of groups in s-block. ( 2 ) 5- Number of groups in d-block. ( 10 ) Page | 5