CCC Class 10 on Quantum and Coordinates

Why do transition metals show a lot of chemical similarities within a given period?

• The valence s and p electrons affect their chemistry more so than the inner d and f electrons, which do not participate in bonding as easily.

• The number of electrons within a given period varies only slightly and is sometimes identical because these metals have more than one ionic form.

• All elements in a given period, including the representative elements, have a lot of chemical similarities due to the gradual increase in atomic number.

• The transition metals always fill their s and p orbitals first before filling their d orbitals, which affects their chemistry.

• None of the answers are correct

Which of the following is incorrect concerning the 3d, 4d, and 5d transition series?

• All of the answers are correct

• There is a significant increase in radius in going from the 3d to the 4d metals, but the 4d and 5d metals are similar in size.

• There is a general decrease in size going from left to right for each of these series due to the increasing nuclear charge.

• The separation of hafnium and zirconium found together in nature is difficult due to their similarities in chemistry, which is attributed to their virtually identical sizes.

• Cerium through lutetium exhibits what is referred to as the lanthanide contraction.

Which metal ion has a d⁵ electron configuration?

• Pd²⁺

• V²⁺

• Ag⁺

• Fe³⁺

• Co²⁺

What is the maximum oxidation state expected for vanadium?

• +8

• +6

• +5

• +4

• +3

Which form of electromagnetic radiation has the longest wavelengths?

• gamma rays

• radio waves

• microwaves

• infrared radiation

• x-rays

Which of the following frequencies corresponds to light with the longest wavelength?

• 3.00 × 10¹³ s^–1

• 4.12 × 10⁵ s^–1

• 8.50 × 10²⁰ s^–1

• 9.12 × 1012 s^–1

• 3.20 × 10⁹ s^–1

What is the energy of a photon of blue light that has a wavelength of 475 nm?

• 4.75 × 10^–7 J

• 4.18 × 10^–19 J

• 6.31 × 10¹⁴ J

• 9.44 × 10^–32 J

• 2.39 × 10^–32 J

When a hydrogen electron makes a transition from n = 3 to n = 1, which of the following statements is true?

I.Energy is emitted.

II.Energy is absorbed.

III.The electron loses energy.

IV.The electron gains energy.

V.The electron cannot make this transition.

• I, IV

• I, III

• II, III

• II, IV

• V

Which of the following is a reasonable criticism of the Bohr model of the atom?

• It makes no attempt to explain why the negative electron does not eventually fall into the positive nucleus.

• It does not adequately predict the line spectrum of hydrogen.

• It does not adequately predict the ionization energy of the valence electron(s) for elements other than hydrogen.

• It does not adequately predict the ionization energy of the first energy level electrons for one-electron species for elements other than hydrogen.

• It shows the electrons to exist outside of the nucleus.

Which of the following statements best describes the Heisenberg uncertainty principle?

• The exact position of an electron is always uncertain.

• The velocity of a particle can only be estimated.

• It is impossible to accurately know both the exact location and momentum of a particle.

• The location and momentum of a macroscopic object are not known with certainty.

• The location and momentum of a particle can be determined accurately, but not the identity of the particle.