Advertisements
Advertisements
प्रश्न
Write an explanation.
Electropositivity
Advertisements
उत्तर
Electropositivity is the tendency of an atom to lose one or more electrons and form a positive ion (cation). Elements that easily donate electrons are called electropositive elements. Electropositivity increases down a group due to an increase in atomic size and decreases across a period due to an increasing nuclear charge.
APPEARS IN
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:
Cl, F, Br, I (increasing order of electron affinity)
In Period 3 of the Periodic Table, element B is placed to the left of element A. On the basis of this information, choose the correct word from the option to complete the following statement:
The element B would have ______ metallic character than A.
Is is metal or non-metal?
Answer the following in respect of element `31/15 P `
What is its valency?
Answer the following in respect of element `31/15 P `
Is it a metal or non - metal
Name any five periods properties.
Give the trend in metallic character:
(i) across the period left to right
Explain the following:
Metallic character of elements decreases from left to right in a period while it increases in moving down a group.
Arrange the elements of group 17 and group 1 according to the given conditions.
Increasing non – metallic character
Which has the maximum metallic character Na, Li or K?
Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element. 
Which non-metallic element has the valency of 2?
Explain
Group 17 elements are non-metals, while group 1 elements are metals.
Supply the missing word from the words given in brackets.
If an element has one electron in its outermost energy level, then it is likely to be _ (metallic, non metallic)
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.
Identify the metallic oxide which is amphoteric in nature.
Write an explanation.
Electronegativity
Write scientific reason.
The metallic character of elements increases while going down the groups.
Write a scientific reason.
The non-metallic character increases while going from left to right in a period.
Metals are good ______ (oxidising agents/reducing agents) because they are electron ______ (acceptors/donors).
