Doubtly
@Doubtly · Joined Feb 2021
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- c. Atomic radius goes on increasing down a group. i. As we move from top to bottom in a group, number of shells increases. ii. The outermost electrons go farther and farther from the nucleus... 1
- b. Metallic character goes on decreasing while going from left to right in a period. i. While going from left to right in a period, electrons are added to the same outermost shell. At the same time, protons get added in the n... 1
- a. Atomic radius goes on decreasing while going from left to right in a period. 1. While going from left to right within a period, the atomic number increases one by one, meaning the positive charge on the nucleus increa... 1
- c. Position of isotopes in the Mendeleev’s and the modern periodic table 1. Isotopes were discovered long time after Mendeleev developed the periodic table. All isotopes of the same element have different atomic m... 1
- b. Structure of the modern periodic table 1. The modern periodic table consists of 7 horizontal rows called the periods and 18 vertical columns called the groups. 2. Apart from these... 1
- Write short notes. a. Mendeleev’s periodic law. 1) Mendeleev organized the period table on the basis of atomic masses of elements. 2. When he arranged the 63 elements known at that time in... 1
- 5. Write the name and symbol of the element from the description. a. The atom having the smallest size. a. The atom having the smallest size. Hydrogen (H) b. The atom having the smallest atomic mass. Hydrogen (H) c. The most electronegative ato... 1
- h. 6C, 3Li, 9F, 7N, 8O Which of the above elements has the highest nonmetallic character? ₆C, ₃Li, ₉F,₇N, ₈O elements and thier electronic configuration: ₆C=2,4 ₃Li=2,1 ₉F=2,7 _( 7)N=2,5 ₈O=2,6 The element with the highest nonmeta... 1
- g. 13A1, 14Si, 11Na, 12Mg, 16S Which of the above elements has the highest metallic character? ₁₃Al, ₁₄Si, ₁₁Na, ₁₂Mg, ₁₆S Element and thier electronic configuratio : ₁₃Al=2,8,3 ₁₄Si=2,8,4 ₁₁Na=2,8,1 ₁₂Mg=2,8,2 ₁₆S=2,8,6 The element wi... 1
- f. 19K, 3 Li, 11Na, 4 Be Which of these atoms has smallest atomic radius? ₁₉K, ₃Li, ₁₁Na, ₄Be elements and thier electronic configuration: ₁₉K=2,8,8,1 ₃Li=2,1 ₁₁Na=2,8,1 ₄Be=2,2 The element with the smallest atomic... 1
- e. 11Na,15P,17Cl, 14Si, 12Mg Which of these has largest atoms? ₁₁Na,₁₅P,₁₇Cl, ₁₄Si, ₁₂Mg element an thier electronic configurations: ₁₁Na=2,8,1 ₁₅P=2,8,5 ₁₇Cl=2,8,7 ₁₄Si=2,8,4 ₁₂Mg=2,8,2 The element whic... 1
- 4 Be, 6 C, 8 O, 5 B, 13A1 Which is the most electropositive element among these? ₄Be, ₆C, ₈O, ₅B, ₁₃Al elements and thier electronic configuration : ₄Be=2,2 ₆C=2,4 ₈O=2,6 ₅B=2,5 ₁₃Al=2,8,3 The most electropositive element... 2
- 7N, 6C, 8O, 5B, 13Al Which is the most electronegative element among these? ₇N, ₆C, ₈O, ₅B, ₁₃Al Elements and thier electronic configuration ₇N=2,5 ₆C=2,4 ₈O=2,6 ₅B=2,3 ₁₃Al =2,8,3 The most electronegative element is... 1
- b. 1 H, 7 N, 20Ca, 16S, 4 Be, 18Ar Which of these elements belong to the second group? ₁H, ₇N, ₂₀Ca,_( 16)S,_( 4 )Be, ₁₈Ar Electronic configuration of atoms :: ₁H=1 ₇N=2,5 ₂₀Ca=2,8,8,2 _( 16)S=2,8,6 _( 4 )Be=2,2 ₁₈Ar=2,8,8 Amon... 1
- a. 3Li, 14Si, 2He, 11Na, 15P Which of these elements belong to be period 3? Electronic configuration of the following elements is: ₃Li = 2,1 ₁₄Si =2,8,4 ₂He= 2 ₁₁Na = 2,8,1 ₁₅P = 2,8,5 According to electronic configu... 1
- 3. An element has its electron configuration as 2,8,2. Now answer the following questions. a. What is the atomic number of this element? 1) The atomic number of this element is 12 b. What is the group of this element? 2) This eleme... 1
- d. In which block of the modern periodic table are the nonmetals found? In P-Block block of the modern periodic table are the nonmetals found . Correct answer is option 2) P-block 1
- c. Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Which of the following element... 1