Fill in the following blanks with suitable words:
(a) The basis for modern periodic table is ______.
(b) The horizontal rows in a periodic table are called ______.
(c) Group 1 elements are called ______.
(d) Group 17 elements are known as ______.
(e) Group 18 elements are called ______.
(f) According to Newlands’ classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the ______ element starting from oxygen.
(a) The basis for modern periodic table is atomic number.
(b) The horizontal rows in a periodic table are called periods.
(c) Group 1 elements are called alkali metals.
(d) Group 17 elements are known as halogens.
(e) Group 18 elements are called noble gases.
(f) According to Newlands’ classification of elements, the properties of sulphur are similar to those of oxygen because sulphur is the eighth element starting from oxygen.
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- Carbon, Group (14) element in the Periodic Table, is known to form compounds with many elements. Write an example of a compound formed with(a) chlorine (Group 17 of Periodic Table)(b) oxygen (Group 16 of Periodic Table)
- State whether the following statement are true or false:(a) Newlands divided the elements into horizontal rows of eight element each. (b) According to Mendeleev’s periodic law, the properties of elements are a periodic function of their atomic numbers. (c) The elements in a group have consecutive atomic numbers.
- (a) What is a group in the periodic table? In which part of a group would you separately expect the elements to have (i) the greatest metallic character (ii) the largest atomic size?(b) In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group. (c) From the standpoint of atomic structure, what determines which element will be the first and which the last in a period of the periodic table? (d) Explain why, the properties of elements are repeated after 2, 8, 18, and 32 elements in the periodic table. (e) What are the advantages of the periodic table?
- (a) What is meant by (i) a group, and (ii) a period, in a periodic table?(b) How many periods and groups are there in the long form of periodic table? (c) Give two examples each of (i) group 1 elements (ii) group 17 elements (iii) group 18 elements.
- Which of the following statement is correct in regard to the classification of elements ?(a) Elements in the periodic table are arranged on the basis of increasing atomic masses (b) Elements in Mendeleev’s periodic table are arranged on the basis of increasing atomic numbers (c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass (d) In modern periodic table, the isotopes of chlorine having diffrenet atomic masses are kept in the same group.
- How many horizontal rows are there in the modern periodic table and what are they called?
- Which of the following statement (s) about the Modern Periodic Table are incorrectThe elements in the Modern Periodic Table are arranged based on their decreasing atomic numberThe elements in the Modern Periodic Table are arranged based on their increasing atomic massesIsotopes are placed in adjoining group (s) in the Periodic TableThe elements in the Modern Periodic Table are arranged based on their increasing atomic number(a) (i) only(b) (i), (ii) and (iii)(c) (i), (ii) and (iv) (d) (iv) only
- Atomic number of a few elements are given below 10, 20, 7, 14(a) Identify the elements(b) Identify the Group number of these elements in the Periodic Table(c) Identify the Periods of these elements in the Periodic Table(d) What would be the electronic configuration for each of these elements?(e) Determine the valency of these elements.
- Fill in the blanks with suitable words:(a) The addition of oxygen to a substance is called _______ whereas removal of oxygen is called ________.(b) The addition of hydrogen to a substance is called _______ whereas removal of hydrogen is called ________.
- (a) What is the usual number of valence electrons and valency of group 18 elements of the periodic table?(b) What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
- Rewrite the following statements after correction, if necessary:(a) Groups have elements with consecutive atomic numbers. (b) Periods are the horizontal rows of elements. (c) Isotopes are the elements of the same group.
- In the modern periodic table, which are the metals among the first ten elements?
- Fill in the following blanks with suitable words :(a) An element is made up of only one kind of ........................(b) Brine is a ........................ whereas alcohol is a ........................(c) Brass is an alloy which is considered a ............................(d) The three important metalloids are ................., .................. and ...................(e) The elements which are sonorous are called ..........................
- Why are metals called electropositive elements whereas non-metals are called electronegative elements?
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