3 In the wave-mechanical model of the atom, an orbital is defined as(1) a region of the most probable proton location
(2) a region of the most probable electron location
(3) a circular path traveled by a proton around the nucleus
(4) a circular path traveled by an electron around the nucleus

Answers

Answer 1

Answer: (2) a region of the most probably electron location. The rest are all false. (1) and (3) are false obviously, because it denotes the location for the proton, which is in the nucleus, and protons don't travel around the nucleus, they are the nucleus, at least a part of it. (4) a circular path traveled by an electron around the nucleus is false because although there are s orbitals which have a spherical shape around the nucleus in its electron shell, it does not mean it travels circularly around the nucleus, nor does it mean it is the only type of orbital shape.

Answer 2

Answer:

In wave mechanical model an orbital is defined as $\boxed{\left( {\text{2}} \right){\text{region of most probable electron location}}}{\text{.}}$

Further explanation:

Bohr's model could not account for duality of matter and also contradicted the Heisenberg uncertainty principle. To overcome these weaknesses, a wave mechanical model was developed. The basis of this model was the Schrodinger wave equation of hydrogen atom.

The salient features of the wave mechanical or quantum mechanical model are as follows:

A. The energy associated with electrons present in atoms can take only certain discrete values. This is known as the quantization of energy.

B. Such quantized energy levels are a consequence of wave characteristics of electrons and allowed values are dictated in accordance with the solutions obtained from the Schrödinger wave equation.

C. The exact position as well the velocity of an electron cannot be precisely determined as it obeys the Heisenberg’s uncertainty principle. This leads to an important concept that path of an electron can never be precisely defined. Therefore it is better to use the term probability of locating electron.

D. The region of space around the atom in which the probability of locating any electron is highest is known as the orbital. The physical significance of the orbital is that it can be described using the values of ${\psi }}$ . There are several possible values of ${\psi }}$ . as can be obtained from the solving of Schrodinger equation. So there are several numbers of orbitals associated with an electron.

E. The utility of ${\psi }}$ is that its square ${\left| {\mathbf{\psi }} \right|^{\mathbf{2}}}$ is directly proportional to the probability of locating an electron at a point within an atom. Hence the orbital is not a circular region of space but a region where the probability of locating an electron is highest.

Therefore, in the wave-mechanical model of the atom, a region of the most probable location is defined as orbital. Hence, the correct option is $\left( {\text{2}} \right)$ .

Learn more:

1. Calculation of volume of gas: brainly.com/question/3636135

2. Determine how many moles of water produce: brainly.com/question/1405182

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Bohr theory and quantum chemistry

Keywords: Wave mechanical model, Bohr model, wave mechanical model, Heisenberg’s uncertainty principle, Physical significance, orbital, Schrödinger wave equation and probability

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Whiskers and beaks are two examples of _____. electroreceptors mechanoreceptors olfactory receptors photoreceptors

Answers

Whiskers and beaks are two examples of _____. electroreceptors mechanoreceptors olfactory receptors photoreceptors

Whiskers and beaks are two examples of olfactory receptors. An olfactory receptor is a smell receptor that contains a protein capable of binding odor molecules that plays the central role of smell.

Answer:

its mechanoreceptors

Explanation:

mechanoreceptors react to pressure and distortion.

the valence electrons of metals jump easily to a higher energy orbital when light shines on them then they all fall emiting the excess energy as light which property of metals is explained by this?

Answers

The valence electrons of metals jump easily to a higher energy orbital when light shines on them then they all fall emitting the excess energy as light show lustrous property of metals.

What are valence electrons?

Valence electrons are defined as a negatively charged particle that can be shared or transmitted between atoms that is found in the outermost shell of an atom. Valence electrons have a crucial role in determining how an atom will behave. The electrical configurations of elements can be used to find valence electrons. The total number of valence electrons in that element is then determined by counting the number of electrons in the outermost shell.

When newly treated, polished, or broken, a material takes on a bright look and conducts electricity and heat reasonably well. Metals are typically ductile and malleable. These traits are the result of the metallic bond that connects the atoms or molecules of the metal.

Thus, the valence electrons of metals jump easily to a higher energy orbital when light shines on them then they all fall emitting the excess energy as light show lustrous property of metals.

To learn more about valence electrons, refer to the link below:

brainly.com/question/13993867

#SPJ2

Answer:

Lustrous

Explanation:

Metals are lustrous which gives them a property of having Shiny surfaces

Which sample of matter is a mixture?
(1) Br2(ℓ) (3) KBr(s)
(2) K(s) (4) KBr(aq)

Answers

Answer:

KBr (aq) is a mixture.

Explanation:

Mixture is defined as the combination of two non reacting species. Let's discuss each option one by one.

a) Br₂(l):

This Bromine is not a mixture because the bracket specifying the state of Br₂ is liquid. Hence, as bromine is a liquid at room temperature, so this compound is purely Br₂.

b) KBr (s):

KBr is also present in pure form because in bracket solid is written.

c) K (s):

Potassium is also present in pure form as the bracket is specifying solid, as KBr is solid at room temperature.

d) KBr (aq):

This is a mixture of KBr and water. Because KBr being an electrolyte when dissolved in water it is hydrated as follow,

KBr (s) -----water------> K⁺ (aq) + Br⁻ (aq)

$\boxed{\left( {\text{4}} \right){\text{ KBr}}\left( {aq} \right)}$ is a mixture.

Further explanation:

Mixture:

It is formed by the physical combination of two or more different substances. Mixtures do not have any fixed formula and their composition is also variable. There is retention in the properties of constituents even after the formation of mixtures.

(1) ${\text{B}}{{\text{r}}_2}\left( l \right)$

Bromine is present in liquid in its pure state. The “l” written in the parenthesis after denotes its physical state which is the same as that of its pure form. So it is not a mixture.

(2) K (s)

Potassium is present in solid in its pure form. The “s” written in the parenthesis after K describes its physical state which is the same as that of its pure form. So it is not a mixture.

(3) KBr (s)

It is an ionic salt which is solid in nature. The “s” written in the parenthesis after KBr denotes its physical state which is the same as that of its pure form. So it is not a mixture.

(4) KBr (aq)

The “aq” written in the parenthesis after KBr indicates that it is present in the aqueous phase. This means it is formed by the combination of KBr and water so it is a mixture.

Learn more:

The major contribution of Antoine Lavoisier to chemistry: brainly.com/question/2500879
Example of physical change: brainly.com/question/1119909

Answer details:

Grade: High School

Chapter: Elements, compounds, and mixtures

Subject: Chemistry

Keywords: mixture, physical combination, substances, fixed formula, variable, composition, retention, properties, Br2, K, KBr.

How many moles of sodium hydroxide are contained in 65.0 mL of a 2.20 M solution?

Answers

2.20 M means there are 2,20 mol of NaOH in 1 000 mL of solution. We can use this proportion as a conversion factor:

$65\ mL\cdot (2.20\ mol)/(1\ 000\ mL) = \bf 0.143\ mol$

What is a chemical bond?a. a representation of chemical properties
b. a substance that's composed of atoms
c. the force that holds together the elements in a compound
d. the attraction of two atoms that holds the atoms togethe?

Answers

Answer: -

A chemical bond is

C) the force that holds together the elements in a compound.

Explanation: -

A chemical bond results when there is a transfer of electrons from 1 element to another or there is a sharing of electrons between two element atoms.

Due to this compounds are formed.

Hence A chemical bond is

C) the force that holds together the elements in a compound.

the correct answer should be c.

Which of these is NOT a physical property of matter?A)
odor
B)
boiling point
C)
melting point
D)
ability to rust

Answers

It would be the ability to rust because matter takes up space.

Final answer:

The ability to rust is not a physical property of matter, but a chemical one, reflecting a substance's capacity to react with oxygen to form a new substance.

Explanation:

In the list provided, the ability to rust is NOT a physical property of matter. Physical properties include traits that can be observed or measured without changing the composition of the material. Examples include melting point, boiling point, odor, and density. The ability to rust, however, is a chemical property as it indicates a substance's ability to react with oxygen to form a new substance, which involves a change in composition.