Transition Metals Flashcards

1
Q

An Orbital

A

A region of an element in which you can find electrons

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2
Q

Order of the Transition Metals

A

Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc

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3
Q

A transition element is an element which..?

A

Possesses a filled or partially filled valence d orbitals in one or more of its oxidation states.

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4
Q

Are all d-block metals transition metals.?

A

Transition Metals are part of d-block of the periodic table of elements, but not all d-block metals may be considered transition metals (e.g Scandium & Zinc)

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5
Q

To be a d-block element, a transition metal must..?

A

To be a d-block element, a transition metal must have an incompletely filled d-orbital

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6
Q

Reasons for the catalytic properties of d-block elements

A
  1. They have unoccupied d-orbitals
  2. They are capable of displaying a range of valencies
  3. They have a proclivity for forming complicated chemicals
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7
Q

Why are transition metals excellent catalysts..?

A

Transition metals are excellent catalysts due to the availability of 3d and 4s electrons and their ability to change oxidation state.

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8
Q

Factors For The Catalytic Properties Of Transition Metals

A
  1. Variable Oxidation State
  2. Large surface area
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9
Q

Types Of Catalysts

A
  1. Homogeneous
  2. Heterogeneous (Solid)
  3. Heterogenised Homogeneous
  4. Biocatalysts
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10
Q

Why do Nickel & Platinum make excellent catalysts..?

A

Because they adsorb strongly enough to hold and activate the reactants while allowing the products to escape

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11
Q

Catalyst

A

A component that changes the rate of a reaction by guiding it down a different path that requires less energy to activate

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12
Q

DTPA⁵-

A

Diethylene triamine penta acetic acid

A complexing agent used for gadolinium

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13
Q

A ligand which served as a complexing agent used for gadolinium

A

DTPA⁵-

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14
Q

Applications Of Complexes

A

In detergents
As a commercial water softener
In M.R.I[Magnetic Resonance Imaging] in Medicine

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15
Q

In photographic processing, excess AgBr is dissolved using what..?

A

A concentrated solution of sodium Thiosulfate(Used in generating black and white film)

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16
Q

Complex Ions

A

The electrically charged complexes with a metal ion in the center which is surrounded and linked by a number of neutral molecules or negative ions

17
Q

Ligands

A

The neutral molecules or negative ions

18
Q

Because of a Lewis acid-base interaction, a complex ion forms..?

A

A metal ion and a ligand

19
Q

The neutral molecules or negative ions

A

Ligand

20
Q

Why does a complex ion form metal ion and a ligand..?

A

Because of a Lewis acid-base interaction

21
Q

Oxidation State Trend In Transition Metals

A

From left to right, the number of common oxidation states increases at first to a maximum towards the middle of the table then decreases.

22
Q

Ionization Energies Trends Of Transition Metals

A

The build up of electrons in the immediately underlying d-sub shells that efficiently shields the 4s electrons from the nucleus and minimizing the increase in effective nuclear charge Zeff from element to element causes a small change in values of the 1st & 2nd ionization energies to be observed from Scandium to Zinc

23
Q

Electronic Configuration Trends Of Transition Metals

Hint: 5 points

A

• It is basically the same for the first row transition elements.
• There is a gradual filling of the 3d orbitals across the series starting from Scandium
• At Chromium & Copper, the population of 3d orbitals increase by acquisition of an electron from the 4s shell.
• In Chromium: both 3d & 4s orbitals are occupied but neither is filled: so, both energies of the orbitals are relatively close for atoms in this row.
• In Copper: the 3d is full but only 1 electron is in the 4s shells; therefore, the 3d orbital energy is lower than the 4s orbital.

24
Q

Melting & Boiling Points Trends Of Transition Metals

Hint: 2 points

A

• Due to the strong metallic bonding in transition metals, the melting point and molar enthalpies of fusion are high(in comparison to other main group elements)
• The strong metallic bond is due to delocalization of electrons, facilitated by the availability of both d and s electrons.

25
Q

Densities & Metallic Radius Trends Of Transition Metals

A

•Transition Elements are much denser than the s-block elements
•There is a gradual increase in density from Scandium to Copper(due to the small & irregular decrease in metallic radii coupled with the relative increase in atomic mass)

26
Q

Physical Properties Of Transition Metals

Hint: 8 points

A

• Have large charge/radius ratio
• Are hard & have high densities
• Have high melting and boiling points
• Form compounds which are often paramagnetic
• Show variable oxidation states
• Form coloured ions and compounds
• Form compounds with profound catalytic activity
• Form stable complexes

27
Q

Properties And Trends In Transition Metals

Hint: 2 points

A

• Electrons in the outer shells of the atoms of these elements have little shielding effects resulting in an increase in effective nuclear charge due to the addition of protons in the nucleus.
• The first 10 transition metals possess similarities in properties(physical and chemical) because of their relatively small difference in effective nuclear charge over the series.