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प्रश्न
In which block of the modern periodic table are the nonmetals found?
पर्याय
s-block
p-block
d-block
f-block
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उत्तर
In p-block of the modern periodic table are the nonmetals found.
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संबंधित प्रश्न
Write the electronic configuration of two elements X and Y whose atomic numbers are 20 and 17 respectively. Write the molecular formula of the compound formed when element X reacts with element Y. Draw the electron-dot structure of the product and also state the nature of the bond formed between both the elements.
The element which forms a basis oxide has the atomic number of:
(a) 18
(b) 17
(c) 14
(d) 19
An element X is in group 2 of the periodic table What will be the formula of its chloride?
The element X forms a compound X2Y. Suggest an element that Y might be and give reasons for your choice.
Rearrange the columns 2 and 3 so as to match with the column 1.
| Column 1 | Column 2 | Column 3 |
| i. Triad | a. Lightest and negatively charged particle in all the atoms | 1. Mendeleev |
| ii. Octave | b. Concentrated mass and positive charge | 2. Thomson |
| iii. Atomic number | c. Average of the first and the third atomic mass | 3. Newlands |
| iv. Period | d. Properties of the eighth element similar to the first | 4. Rutherford |
| v. Nucleus | e. Positive charge on the nucleus | 5. Dobereiner |
| vi. Electron | f. Sequential change in molecular formulae | 6. Moseley |
The number of electrons in the outermost shell of alkali metals is ______.
What is the need for classification of elements?
What was the basis of the earliest attempts made for classification and grouping of elements?
Give a reason why elements need to be properly classified.
Write the name.
The atom having smallest atomic radius from group 1.
The number of periods and groups in the periodic table are ______
______ group contains the member of the halogen family.
Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group?
Which of the following hydroxides is most basic?
Which of the following property will be common in group 1 elements?
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al
Complete the following cross word puzzle
Across:
(1) An element with atomic number 12.
(3) Metal used in making cans and member of Group 14.
(4) A lustrous non-metal which has 7 electrons in its outermost shell.
Down:
(2) Highly reactive and soft metal which imparts yellow colour when subjected to flame and is kept in kerosene.
(5) The first element of second Period
(6) An element which is used in making fluorescent bulbs and is second member of Group 18 in the Modern Periodic Table
(7) A radioactive element which is the last member of halogen family.
(8) Metal which is an important constituent of steel and forms rust when exposed to moist air.
(9) The first metalloid in Modern Periodic Table whose fibres are used in making bullet-proof vests
Relate the names of the following scientists with the statements given below.
Arranged elements into groups containing three elements each.
Complete the following triads by inserting the missing elements.
Li, ______, K
Justify. Element 'X' forms an oxide with the formula X2O3 which is a solid with a high melting point. ‘X’ would most likely be placed in the group of the Periodic Table as Al.
