Advertisements
Advertisements
Question
Write an explanation.
Electropositivity
Advertisements
Solution
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
RELATED QUESTIONS
Arrange the following as per the instructions given in the brackets:
Cl, F, Br, I (increasing order of electron affinity)
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
A metal M forms as oxide having the formula M2O3. It belongs to third period. Write the atomic number and valency of the metal.
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?
For the main group of the periodic table, the metallic properties of the elements vary approximately with their position as shown in the table.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| H | He | ||||||
| A | B | ||||||
| C | D |
Will the most metallic element be found at A,B,C or D ?
Within a group, where would you expect to find the element with the greatest metallic character.
Identify the metallic oxide which is amphoteric in nature.
Refering to changes in the properties of elements on moving from left to right across a period of the periodic table. Choose the correct answer.
The non-metallic character of the elements :
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.
3, 1, 2 electrons are in valence shells of X, Y, Z elements resp. From this information, write the name of the groups it belongs to and its valency.
The lightest liquid metal is ______
Which of the following sets of atomic numbers belong to that of alkali metals?
Three elements B, Si and Ge are
Identify the elements with the following property and arrange them in increasing order of their reactivity
- An element which is a soft and reactive metal
- The metal which is an important constituent of limestone
- The metal which exists in liquid state at room temperature
Which of the following metal (s) do not react with water?
The given table shows elements with the same number of electrons in its valence shell.
| Elements | A | B | C |
| m.p. | 63.0 | 180.0 | 97.0 |
Arrange them in order of increasing metallic character.
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 question in relation to the above group of elements:
Will the elements in the group to the right of this boron group be more metallic or less metallic in character? Justify your answer.
