1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
scoundrel [369]
3 years ago
12

The melting points for the second series transition elements increase from 1526˚C for yttrium to 2623˚C for molybdenum and then

decrease again to 321˚C for cadmium. Account for this trend in terms of band theory.
Chemistry
1 answer:
boyakko [2]3 years ago
6 0

Answer:

The melting points of the second series of transition elements are electrons are entering to the type of orbital.

Explanation:

Transition elements have "d" band that can overlap with the "s' band to give a composite band. The composite band have six molecular orbitals per metal atom.

Half of the molecular orbitals are the anti bonding.So, maximum bonding occurs when the molecular orbitals contains six electrons i.e. the metal has six valence electrons per each metal atom.

When the maximum bonding occurs then it shows maximum melting point.

So, molybdenum shows melting point at 2623^{o}C and after that the electrons goes into the antibonding and reaches minimum for cadmium when the anti boning orbital is completely filled. So, the melting point of the cadmium is tex]321^{o}C[/tex].

You might be interested in
Enthalpy change is the
PtichkaEL [24]

Answer:

I believe is A

Explanation:

Enthalpy change is the name given to the amount of heat evolved or absorbed in a reaction carried out at constant pressure.

3 0
3 years ago
When NH NO3(aq) reacts to form N2O(g) and H2O(1), 150 kJ of energy are evolved for each mole of NH NO3(aq) that reacts.
amid [387]
Billy bobbbbbbbbbbbbbbbbbbbbbbb
4 0
3 years ago
Given the balanced equation:
poizon [28]
The answer is (2) 10.0 mol. The equation given is balanced. So the ratio of mol number of compound is the ratio of the number before the compound. The HCl and CO2 ratio is 2:1. So the answer is 10.0 mol.
5 0
3 years ago
Which among the following statements is FALSE? Group of answer choices None of the above A liquid has a definite volume; but it
Vesna [10]

Answer: None of the above statements is false.

Explanation:

In a solid substance, particles are closely held together due to which a solid substance has definite shape and volume. Therefore, solids are also incompressible in nature.

In liquids, the molecules are slightly away from each other due to which they can slide past each other. Hence, liquids do not have a fixed shape but they have a definite volume. Liquids are also incompressible in nature.

In gases, the particles are held by Vander waal forces due to which they move rapidly from one place to another. Hence, gases are highly compressible in nature.

Thus, we can conclude that none of the given statements are false.

4 0
3 years ago
A renewable energy source that relies on falling from a height levels to produce electricity is
DochEvi [55]
<h3><u>Answer;</u></h3>

Hydroelectric power

<h3><u>Explanation</u>;</h3>
  • Hydroelectric power is produced when a turbine converts the kinetic energy of falling water into mechanical energy. Then a generator converts the mechanical energy from the turbine into electrical energy.
  • Hydroelectric power plants uses a dam on a river to store water in a reservoir. Water released from the reservoir flows through a turbine, spinning it, which in turn activates a generator to produce electricity.
6 0
3 years ago
Other questions:
  • A generic gas, x, is placed in a sealed glass jar and decomposes to form gaseous y and solid z. 2x(g)↽−−⇀y(g)+z(s) how are these
    6·2 answers
  • What reaction shows one element taking the place of another in a compound?
    14·1 answer
  • The time required for Earth to rotate once on it's axis
    12·2 answers
  • Which part of a plant cell is responsible for converting light energy into chemical energy?
    6·2 answers
  • Under the proper conditions, bromomethane (ch3br) will react with potassium hydroxide (koh) to form _____ and a salt. methanol (
    12·2 answers
  • Why is it important to know which category of microorganism has caused an infection?
    6·2 answers
  • Which of the following elements has the ability to undergo sublimation
    5·1 answer
  • A system fitted with a piston expands when it absorbs 53.1 ) of heat from the surroundings. The piston is working against a pres
    5·1 answer
  • What enzymes Break it down sugar ???
    5·1 answer
  • How you rank the following items in order of complexity.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!