The atomic number of an element is 16. What is the group number of this element in periodic Table?
A. 15
B. 2
C. 16
D. 4
1 Answers
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If the atomic number of an element is 33, it will be placed in the periodic table in the ____
Correct Answer - C The electronic configuration of element with atomic number 33 is `1s^(2),2s^(2),2p^(6),3s^(2) 3p^(6), 4s^(2),3d^(10),4p^(3)`. As, its last shell have five electrons and hence, its group is 10 +...
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Explain the following: (i) Why argon (atomic mass `= 39.94)` has been placed before potassium (atomic mass `= 39.10)` in the Modern periodic table? (i
Correct Answer - (i) In modern periodic table, elements have been placed in order of their increasing atomic numbers. The atomic number of argon is 18 and that of potassium...
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Atomic number of `Ag` is 4.7. in the same group, the atomic numbers of elements placed above and below `Ag` in Long form of periodic table will be:
Correct Answer - C Silver belongs to `V^(th)` period. So the atomic number of element placed above and below will be `47 - 18 = 29` and `47 +32 = 79`...
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In modern periodic table, the element with atomic number `Z = 118` will be:
Correct Answer - D `Z = 118 [Rn]^(86)5f^(14)6d^(10)7s^(2)7p^(6)`, as last electron enters in `p`-subshelll, it belongs to `p`-block. Thus its group number will be `10 +2 +6 = 18`. Hence the...
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Identify the group (in Modern Peridic Table) and valency of a hypothetical elemt having atomic number 11.9. if group number is `x` and valency is `y`.
Correct Answer - 2 `8s^(1)` `x = 1, y = 1` `1+ 1 = 2`.
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Atomic number of `Ag` is 47. In the same group the atomic numbers of elements placed and below `Ag` in long form of periodic table will be `x` and `y`
Atomic number of `Cu` is `29 = x` Atomic number of `Au` is `79 = y` `x +y = 108` `(x+y)/(12) = (108)/(12) = 9`.
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Select the properties which increases regularly with increase in atomic number in atomic number in first group elements of modern periodic table
Correct Answer - A::D (A) Order of metallic character `: Li lt Na, Klt Rb lt Cs` (B) Each element of the group has `ns^(1)` configuration and `1e^(-)` in its valance...
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The element of zero group of the Periodic Table is –
Option : C. He
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La belongs to group 3 while Hg belongs to group 12 and both belong to period 6 of the periodic table.
i. La and Hg both belongs to period 6. Therefore, n = 6. ii. Elements of group 3 to group 12 belong to the d-block of the modem periodic table. iii. The general outer...
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A produces B by α- emission. If B is in the group 16 of periodic table, what is the group of A ?
\(_Z^AA \overset{\propto-Emission}\longrightarrow\) \(_{Z-2}^{A-4}B\) + \(_2^4He\) When α-emission occurs, atomic number decreases by 2 and atomic mass number by 4. Thus, If ‘B’ belongs to group 16 of periodic table, that means outermost orbit will contain 6...
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