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प्रश्न
Elements with stable electronic configurations have eight electrons in their valence shell. They are ______.
पर्याय
halogens
metals
noble gases
non metals
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उत्तर
Elements with stable electronic configurations have eight electrons in their valence shell. They are noble gases
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संबंधित प्रश्न
Separate the following compounds into three categories - ionic, polar and covalent compounds; N2, NH4Cl, NH3, NO, NH4NO3, NCl3.
Five atoms are labeled A to E
|
Atoms |
Mass No |
Atomic No. |
|
A |
40 |
20 |
|
B |
19 |
9 |
|
C |
7 |
3 |
|
D |
16 |
8 |
|
E |
14 |
7 |
(a) Which one of these atoms:
(i) contains 7 protons
(ii) has electronic configuration 2,7
(b) Write down the formula in the compound formed between C and D
(c) Predict : (i) metals (ii) non-metals
Draw orbit structure diagram of sodium chloride (NaCl).
Number of valence electrons in carbon is ______.
Sodium having atomic number 11, is ready to ______ electron/ electrons to attain the nearest noble gas electronic configuration.
The element that would form anion by gaining electrons in a chemical reaction is ______.
______ theory explains the formation of molecules.
Match the following:
| 1. | Atomic bond | a. | Oxygen and hydrogen |
| 2. | Atoms with different electronegativities | b. | acceptor bond |
| 3. | An atom that accepts electron pair | c. | covalent bond |
| 4. | Rusting of iron | d. | donor atom |
| 5. | An atom that provides electron pair | e. | oxidation |
| f. | ionic bond |
What is meant by a chemical bond?
Elements A, B and C have atomic number 17, 19 and 10 respectively.
State which one is a metal.
