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प्रश्न
Identify the bond between H and F in the HF molecules.
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उत्तर
The bond between Hydrogen (H) and Fluorine (F) in an HF molecule is polar covalent.
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संबंधित प्रश्न
Rewrite the following statement after correction, if necessary:
Groups have elements with consecutive atomic numbers.
Rewrite the following statement after correction, if necessary:
Periods are the horizontal rows of elements.
A metal X is in the first group of the periodic table. What will be the formula of its oxide?
Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table. Compare them with respect to:
(i) the number of valence electrons in their atoms
(ii) their valencies
(iii) metallic character
(iv) the sizes of their atoms
(v) the formulae of their oxides
(vi) the formulae of their chlorides
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 |
How did the early chemists classify elements?
What is the atomic number of elements of period 3 and group 17 of the Periodic Table?
Consider the following elements 20Ca, 8Or 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be in group 16 of the Periodic Table?
Which one of the following does not increase while moving down the group of the periodic table?
Which of the following metals have low melting and boiling point?
