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प्रश्न
Write an explanation.
Electropositivity
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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.
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संबंधित प्रश्न
Arrange the following as per the instruction given in the bracket.
Cs, Na, Li, K, Rb (increasing order of metallic character).
Answer the following in respect of element `31/15 P `
What is its valency?
Give the trend in metallic character:
(i) across the period left to right
How does the chemical reactivity of
alkali metals vary?
The elements at the bottom of a group would be expected to show ______ metallic character than the element at the top.
Which has the maximum metallic character Na, Li or K?
Choose the correct answer.
An alkaline earth metal
(i) Lead
(ii) potassium
(iii) calcium
(iv) Copper
Write a scientific reason.
Metallic character goes on decreasing while going from left to right in a period.
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?
Among the elements of the second period, Li to Ne, pick out the element that is the most reactive metal
Copy and complete the following sentence choosing the correct word or words from those given below, at the end of the sentence:
The element at the bottom of a group would be expected to show ______ metallic character than the element at the top.
Arrange the following elements in order of their decreasing metallic character.
Na, Si, Cl, Mg, Al
The tendency of an element to form anion is the ______ character of that element.
The metallic character of the element decreases moving across a period from left to the right.
An element has atomic number 17. To which group, the period does it belong? It is metal or non-metal?
Which of the following set of elements is written in order of their increasing metallic character?
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
Choose the odd one out and write the reason:
Arrange:
Be, Li, C, B, N, O, F (in increasing metallic character).
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.
