1718W
1817W
3517W
3518W
Correct answer is C
The superscript is the atomic mass = 35
(The mass number also called atomic mass number or nucleon number, is the total number of protons and neutrons)
The subscript is the atomic or proton number = 17
The number of electrons in a neutral atom is equal to the number of protons.
Which of the following transition metals is not attracted to external magnetic field?
Cu
Fe
Ti
Zn
Correct answer is A
The period 4 transition metals are scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), and zinc (Zn).
Diamagnetism results from the lack of unpaired electrons. Diamagnetic substances are substances that are repelled by magnetic fields.
The examples of diamagnetic materials are copper, gold, antimony, silver, lead and hydrogen.
The electron configuration of \(_{26}Fe^{3+}\) is?
[Ar]4s23d6
[AR]4s23d3
[AR]4s13d4
[AR]4s03d5
Correct answer is D
The neutral Iron atom has the electric configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d6.to write the electronic config. of Fe3+ we have to subtract 3 electrons from the outermost shell which is 4s and 3d orbitals. Thus we obtain the electronic configuration for Fe3+ as:
1s2 2s2 2p6 3s2 3p6 4s0 3d5
OR
[AR] 4s0 3d5.
Which of the following processes is used in food preservation in an industry?
Carbon dating
Ieeadiation of gamma rays
Nuclear fission
Nuclear fusion
Correct answer is B
No explanation has been provided for this answer.
Which of the following arrangements is in decreasing order of atomic radius?
Li>Be>C>
Li>B>Be>C
Li>Be>B>C
C>B>Be>Li
Correct answer is C
No explanation has been provided for this answer.
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