Which of the following represents the correct order of metallic character of the given elements?
- $Be < Si < Mg < K$
- $K < Mg < Be < Si$
- $Be < Si < K < Mg$
- $Si < Be < Mg < K$
The Correct Option is D
Solution and Explanation
Metallic character refers to the ability of an element to lose electrons and form positive ions. As we move down a group in the periodic table, the atomic size increases, and the outer electrons are further from the nucleus, making it easier for the element to lose electrons. This results in an increase in metallic character down a group. On the other hand, as we move from left to right across a period, the atomic size decreases, and the effective nuclear charge increases, making it harder for the element to lose electrons.
Therefore, metallic character decreases across a period from left to right. Among the given elements: Potassium (K) is an alkali metal located in Group 1, and it is farthest to the left and down the group. Therefore, it has the highest metallic character. Silicon (Si), being a metalloid in Group 14, has a lower metallic character compared to metals. It is further to the right and higher in the period, so it has the least metallic character among the elements listed. So, the correct sequence is \(Si < Be < Mg < K\).
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Top JEE Main p -Block Elements Questions
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\[ \begin{array}{ccc} \text{ClO}_4^- & \text{IO}_4^- & \text{BrO}_4^- \\ E^\circ = 1.19 \, \text{V} & E^\circ = 1.65 \, \text{V} & E^\circ = 1.74 \, \text{V} \\ \end{array} \]
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Choose the most appropriate from the option given below: The number of oxygen atoms present in chemical formula of fuming sulphuric acid is _______.
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(B) Non metals have lower ionisation enthalpy than metals.
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Concepts Used:
P-Block Elements
- P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
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P block elements consist of:
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- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family