B) magnetic pole.
Explanation:
The magnetic pole is the area around a magnet where magnetic effect is the strongest.
Around a magnet, there is a force field in which the effect of magnet is felt.
- The strongest intensity of the force is felt at the pole.
- The magnetic force field leaves the north pole and enters through the south.
- Magnetic materials and magnets are drawn closer to the poles.
- The earth also like a magnet.
- The magnetic north is located close to the geographic north pole and also for the south pole.
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Answer:
Rb
Explanation:
Second ionization energy is the energy required for the removal of the second loosely bonded valence electron from an isolated gaseous atom.
The given elements:
Rb , Sr, Y and Zr
These are the elements of the fifth period.
The electronic configuration of Rb -
The electronic configuration of Sr -
The electronic configuration of Y -
The electronic configuration of Zr -
<u>When one electron is removed from Rb, the cation attains the noble gas configuration due to which the removal of second electron from Rb is very very difficult. Thus, Rb has the largest second ionization energy.</u>
The values of the second ionization of these elements are:
Rb = 2633 kJ/mol
Sr = 1064.2 kJ/mol
Y = 1180 kJ/mol
Zr = 1270 kJ/mol
The answer is A) Sodium is an Alkali metal and is in group IA with an ionic charge of +1. While chlorine, Cl, is a halogen and is in group VIIA with a charge of -1. These will form NaCl(s).
We don't know what statement you want us to choose from. But, protons have a positive charge, and they are what makes an atom a certain atom.