30#.. Which of the following concerning second ionization energies is true A) Th

Question

30#.. Which of the following concerning second ionization energies is true

A) That of Al is higher than that of Mg because Mg wants to lose the second electron, so it is easier to take the second electron away.

B) That of Al is higher than that of Mg because the electrons are taken from the same ebergy level, but the Al atom has one more proton

C)That of Al is lower than that of Mg because Mg because Mg wants to lose the second electron,thus the energy change is greater.

D) That of Al is lower than that of Mg because the second electron taken from Al is in a p orbital , thus it is easier to take

E) The second ionization ebergies are equal for Al and Mg

21## Which of the following statements are false

i. It takes less energy to add an electron to nitrogen than to carbon because nitrogen will be closer to achieving a noble gas configuration.

ii. It takes more energy to add an electron to fluorine than to oxygen because the radius of fluorine is smaller and more repulsion would occur in the p-orbitals

iii. It takes more energy to add an electron to nitrogen than to carbon because of the extra repulsions that would occur in the 2p orbitals

iv. less energy is released in adding an electron to iodine than to chlorine because the radius of iodine is larger and the electron is added at a distance further from the nucleus.

A) II,III B)I,II,IV C)III only D) I,II E)all of the above are false

17## Which one of the following statements about atomic structure is false?

A) An atom is mostly empty space.

B) Almost all of the mass of the atom is concentrated in the nucles.

C) The protons and neutron in the nucleus are very tightly packed

D) The number of protons and neutrons is always the same in the neutral atom.

E) All of the above

Explanation / Answer

A:- Q.30 => B)

      Q.21=> D)

      Q.17=> D)

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