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- Question
The reactivity of an atom arises from
Options- A. the existence of unpaired electrons in the valence shell
- B. the energy differences between the electron shells
- C. the sum of the potential energies of all the electron shells
- D. the average distance of the outermost electron shell from the nucleus
- Correct Answer
- the existence of unpaired electrons in the valence shell
ExplanationWhen atoms react they do so in order to reach the lowest energy, which is the most stable. The electrons orbitals will overlap in the way that reduces the energy the most. Orbitals of similar energy will produce the greatest stabilisation.The answer you gave isn't the whole story, it depends what species is reacting with what. The effective nuclear charge on the atom will affect the energy of the valance electrons.
Hence, the reactivity of an atom arises from the existence of unpaired electrons in the valence shell.
- 1. The author of controversial book 'Lajja' is a citizen of
Options- A. Pakistan
- B. Indonesia
- C. Bangladesh
- D. India Discuss
- 2. Which of the following important rivers of India does not originate from the Western Ghats?
Options- A. Cauvery
- B. Godavari
- C. Krishna
- D. Mahanadi Discuss
- 3. The last major glacial period began about 2,000,000 years before present and is commonly known as
Options- A. Pleistocene or ice age
- B. Paleocene or ice age
- C. Pliocene or ice age
- D. Holocene or ice age Discuss
- 4. Amjad Ali Khan is associated with which of the following musical instruments?
Options- A. Sarod
- B. Veena
- C. Violin
- D. Sitar Discuss
- 5. The Himalayan mountain system belongs to which of the following?
Options- A. Volcanic mountains
- B. Residual mountains
- C. Block mountains
- D. Fold mountains Discuss
- 6. The year 788 AD was a good one for Hinduism. Why?
Options- A. Shankracharya was born that year.
- B. Harsha Vardhana, the last Buddhist king, died.
- C. Samudragupta converted to Hinduism.
- D. All Muslim invaders were defeated. Discuss
- 7. What Karl Benz invented?
Options- A. Gasoline powered automobile
- B. Streetcar
- C. Glider
- D. Steam turbine Discuss
- 8. Most common disease of poultry in India is
Options- A. fowl pox
- B. tick fever
- C. ranikhet
- D. coryza Discuss
- 9. The northern hemisphere and the southern hemisphere are separated by
Options- A. the International Date line
- B. the plane of the equator
- C. the plane of Tropic of Cancer
- D. the plane of Tropic of Capricorn Discuss
- 10. The largest country of the world by geographical area is
Options- A. Russia
- B. Vatican City
- C. Australia
- D. USA Discuss
More questions
Correct Answer: Bangladesh
Correct Answer: Mahanadi
Correct Answer: Pleistocene or ice age
Correct Answer: Sarod
Correct Answer: Fold mountains
Correct Answer: Shankracharya was born that year.
Correct Answer: Gasoline powered automobile
Explanation:
Invented in 1885.
Correct Answer: ranikhet
Correct Answer: the plane of the equator
Correct Answer: Russia
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