(a) In the modem periodic table, which are the metals among the first ten elements?(b) What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
(a) In the modern periodic table, Lithium(Li) and beryllium(Be) are metals among the first ten elements.
(b) The significance of atomic numbers in the periodic table is that it relates to the periodicity in the properties of elements to the periodicity in their electronic configurations. The elements placed in the same group show similar chemical properties.
For example, the atomic number of lithium is 3 (2,1). It is placed in the first group as the valence electron is 1 and sodium has the atomic number of 11 (2,8,1) having 1 valence electron and belongs to the same group.
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- In the modern periodic table, which are the metals among the first ten 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.
- (a) What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?(b) What is the number of elements in: (a) 1st period, and (b) 3rd period, of the modern periodic table?
- (a) What is the significance of the symbol of an element? Explain with the help of an example.(b) Explain the significance of the symbol H.
- (a) On which side of the periodic table will you find metals?(b) On which side of the periodic table will you find non-metals? (c) What is the name of those elements which divide metals and non-metals in the periodic table?
- 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
- 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
- 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.
- Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table.
- (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?
- What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
- List the valency of the first 30 elements of the periodic table.
- What is the total number of non-metals in the periodic table?
- 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
- Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how the valency of an element is calculated on the basis of its atomic number.
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