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प्रश्न
Write an explanation.
Electronegativity
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उत्तर
Electronegativity is the tendency of an atom to attract the shared pair of electrons towards itself in a chemical bond. Elements with high electronegativity strongly pull electrons, while those with low electronegativity tend to lose electrons easily. Electronegativity decreases down a group due to increased atomic size and increases across a period due to increasing nuclear charge.
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संबंधित प्रश्न
Choose the word or phrase from the brackets which correctly complete the following statement:
Metals are good ______ (oxidizing agents/reducing agents) because they are electron ______ (acceptors/donors).
Arrange the following as per the instructions given in the brackets:
Na, K, Cl, S, Si (increasing order ionization energy)
Is is metal or non-metal?
Answer the following in respect of element `31/15 P `
What is its valency?
Explain the following:
Group 17 elements are strong non-metals, while group 1 elements are strong metals.
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
- Is it a metal or a non-metal?
- Is it more or less reactive than calcium?
- What is its valency?
- What will be the formula of its phosphate?
- is it larger or smaller than caesium (Cs) in size?
The elements at the bottom of a group would be expected to show ______ metallic character than the element at the top.
iii) Observe the figure and answer the following questions.
a) Identify the block shown by box A and write an electronic configuration of any one element of this block.
b) Identify the block of element denoted by letter B and write its period number.
In Period 3, the most metallic element is ______.
Mg2+, Cu2+, Na1+, H1+ (In the order of preferential discharge at the cathode)
In the third period, which is the most metallic and most non-metallic element?
A group of elements in the periodic table is given below (Boron is the first member of the group and thallium is the last.)
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following questions in relation to the above group of elements:
- Which element has the most metallic character?
- Which element would be expected to have the highest electronegativity?
- If the electronic configuration of aluminium is 2, 8, 3, how many electrons will be there in the outermost shell of thallium?
- The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.
- Will the elements in the group to the right of this boron group be more metallic or less metallic in character? Justify your answer.
The tendency of an element to form cation is the ______ character of that element.
Write the name.
The atom having the smallest atomic radius from zero group.
Which of the following set of elements is written in order of their increasing metallic character?
The metal which is hard and has a high melting point and used in filaments of electrical bulbs is ______
Metals are good ______ (oxidising agents/reducing agents) because they are electron ______ (acceptors/donors).
Arrange:
Be, Li, C, B, N, O, F (in increasing metallic character).
