Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
3472
How do the melting points of elements in Group VII-A change as you move down the group?
Melting points generally increase down Group VII-A (halogens) due to increasing atomic size and stronger London dispersion forces between atoms. These stronger forces require more energy to overcome, leading to higher melting points.
3473
Which element among the following has a higher first ionization energy?
Nitrogen (N) has a higher first ionization energy due to its half-filled p-subshell configuration, which provides extra stability. This makes it harder to remove an electron from N compared to the other options.
3474
When electrons collide with heavy metals than ___________ are produced?
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
3475
What was the approximate TNT equivalent of the energy released by the atomic bomb dropped on Nagasaki, Japan?
The atomic bomb dropped on Nagasaki, Japan, released an enormous amount of energy, equivalent to around 20 kilotons of TNT. This massive release of energy caused widespread destruction and loss of life.
3476
Which of the following subatomic particles has the greatest mass?
Among the given options, the neutron has the greatest mass. A proton is slightly less massive than a neutron, while an electron is much lighter. Thus, the neutron is the heaviest subatomic particle listed.
The mass of one mole of an electron is extremely small, approximately 0.55 u (unified atomic mass units), which is the standard unit for measuring the mass of particles.
3478
An element having low value of ionization energy and low value of electron affinity is likely to belong to__________________?
Manual review recommended: automated enrichment was incomplete for this item. The original answer and options were preserved. No Gemini key is configured. Add GEMINI_API_KEY to the local server environment or save a Gemini provider key in Settings.
3479
What is the electronic configuration of Mn (Atomic Number 25) in its ground state?
The correct answer is 1s2 2s2 2p6 3s2 3p6 4s2 3d5 because the atomic number of Mn (Manganese) is 25. In the provided options, this configuration represents the correct electron configuration for Mn in its ground state. Mn has 25 electrons, and this configuration accounts for the outermost electrons, following the rule of filling energy levels from low to high.
3480
What gives a flash on a photographic plate when exposed to positive rays?
ZnS (zinc sulfide) is a type of photoemissive material that emits light when exposed to positive rays, such as ultraviolet radiation, due to its ability to release electrons. This property is used in photographic flash devices.
