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) The statement is False.
Newlands divided the elements into horizontal rows of seven elements each.
(b) The statement is False.
According to Mendeleev's periodic law, the properties of elements are a periodic function of their atomic masses.
(c) The statement is False.
The elements in a period have consecutive atomic numbers.
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- 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.
- According to Mendeleev’s Periodic Law, the elements were arranged in the periodic table in the order of(a) increasing atomic number(b) decreasing atomic number(c) increasing atomic masses(d) decreasing atomic masses
- 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.
- Name the Russian chemist who said that the properties of elements are a periodic function of their atomic masses.
- The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here not the chemical symbols of the elements):
- 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.
- The atomic numbers of three elements A, B, and C are given below:Element Atomic number
- (a) State the merits of Mendeleev’s classification of elements.(b) Describe two anomalies of Mendeleev’s periodic classification of elements.
- 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
- (a) State Mendeleev’s periodic law.(b) What chemical properties of elements were used by Mendeleev in creating his periodic table? (c) State any three limitations of Mendeleev’s classification of elements. (d) Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table ? (e) Which group of elements was missing from Mendeleev’s original periodic table?
- (a) Explain why:(i) All the elements of a group have similar chemical properties. (ii) All the elements of a period have different chemical properties. (b) The atomic radii of three elements X, Y, and Z of a period of the periodic table are 186 pm; 104 pm, and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.
- (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?
- 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.
- (a) In this ladder (Figure 5.2) symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the Periodic Table.(b) Arrange them in the order of their group also."
- The arrangement of elements in the Modern Periodic Table is based on theirincreasing atomic mass in the periodincreasing atomic number in the horizontal rowsincreasing atomic number in the vertical columnsincreasing atomic mass in the group
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