Chemistry, 18.07.2019 10:30 allieballey0727

On a bar magnet, where are lines of magnetic force the greatest? a. near both magnetic poles b. near the south pole c. near the north pole d. near the center of the magnet

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Answer from: angelinamadriga

The correct answer is "near both magnetic poles".

Explanation:

Bar magnet is the permanent magnet. It has two poles: South pole and North pole. The poles of the bar magnet are fixed. Th poles cannot be changed.

The strength of the magnetic field can not be increased or decreased. The domains of the permanent are permanent aligned.

Same poles repel each other. The opposite poles attract each other.

Magnetic field lines are the surrounding around the magnet in which the magnetic force can be experienced. The lines of magnetic force are stronger near both magnetic poles. The strength of the magnetic field lines of force decreases with distance from the poles.

Therefore, the correct option is (A).

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Answer from: Quest

Woah that’s a lot to read xd i’ll try though. i’ll get back t you if. i know the andwer

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On a bar magnet, where are lines of magnetic force the greatest? a. near both magnetic poles b. nea...