A certain oxygen atom has the electron configuration 1s22s22px22py2. How many unpaired electrons are present? Is this an excited state of oxygen? In going from this state to the ground state, would energy be released or absorbed?

Q: Explain Hund's rule and the Pauli exclusion principle. Justify your answer by providing an example…

A: Hund’s rule states that in the orbitals of the subshell, the electrons fill one by one till the…

Q: Three of the known wavelengths of the emission spectrum of helium are 402.6 nm, 447.1 nm and 587.5…

A: Electromagnetic spectrum involves different radiations from the lowest to the highest frequency…

Q: This energy diagram shows the allowed energy levels of an electron in a certain atom. (Note: the SI…

A: Answer: As per the energy diagram, in the given atom, electron has 3 energy levels named as A, B and…

Q: 8. How much energy (in kilojoules) is released by a hydrogen atom when an electron falls from the…

A: The energy of nth orbital of a hydrogen atom is calculated by the formula, The wavelength of…

Q: 9-From the energy levels of the hydrogen atom draw the energy levels of 2He* ? 10-From the energy…

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Q: The incorrect representation of the Bohr atomic model shown in Figure 2 was found on the internet.…

A: 5 statements are given . We have to choose one incorrect statement

Q: Which of the following subshells does not exist in atoms? 2d O 6s O 3p

A: a) 2d & b) 6s can not exist in atom. In 2nd energy level there is only two subshells are there,…

Q: Which orbital is NOT completely full in ground state Sr? O 4p O 3p O 5s O 4s O 4d

A: • Sr is the chemical symbol of Strontium    • Sr is a chemical element whose atomic number is 38…

Q: Jazmine Understanding the organization of the electromagnetic spectrum A few different types of…

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Q: 2. What is the ground state electron configuration for a sulfur atom? . 3. Which of the following is…

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Q: The maximum number of orbitals in the p sublevel is ? 9 O 2 O 3 O 10 O 6 O 4

A: Given information,     p sublevel

Q: Some chemical reactions, such as formation of ozone in Earth's stratosphere, can be initiated by…

A: Answer:The energy associated with one mole of photons will be:

Q: • The work function energy for a particular metal is 2.80 eV (electron volts) per electron ejected.…

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Q: QUESTION 8 What do you expect the electrons in an atom to do if they are slowly hit by electrons…

A: As the energy is just under n=3.So there is no chance to jump the electron from n=2 to n=3.   There…

Q: What orbital will an electron with the quantum numbers: l = 0 and ml = 0 occupy?

A: Applying concept of quantum number.

Q: The electron configuration for nitrogen is 1s? 2s2 2p3. What does the 3 in 2p3 mean?

A: '3' represent number of electrons  'p' represent orbital or subshell  2'' represent energy level or…

Q: 9. Spectral lines are shown in the image below. But what are they? Explain how spectral lines are…

A: Each element  have different  spectra due to different number of electrons  in valence  shell.

Q: potassium k metal is more reactive than Calcium (Ca). Briefly explain this statement using atomic…

A: A question based on atoms. Reactivity of Potassium metal is to be analyzed after comparing to…

Q: 83 Which of the following electron configurations corre- sponds to the ground state and which to an…

A: An atom is mainly composed of three sub-particles; electrons, protons and neutrons. These particles…

Q: What is the maximum number of electrons that could be held in orbitals that have an energy level of…

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Q: An electromagnetic radiation is fired at a hydrogen atom causing electron excitation from n = 1 to n…

A: When an electron gain energy it is excited to higher energy level. On reaching the higher level it…

Q: ے EI, الامممممما Mg Si

A: Answer: Energy required to remove an electron from an isolated gaseous atom or ion is called as its…

Q: How much energy is released when an electron in hydrogen atom moves from an energy level of n=7 to…

A: The energy change associated with an electron transitioning between energy levels in a hydrogen atom…

Q: Use the periodic table to write electron configurations for each of the following elements.…

A: Since, Electronic configuration represent the electron present in orbital in which way. Arrangement…

Q: Example #1: a) Ag total electrons b) Cl total electrons с) Са total electrons

A: Total number of electrons = Number of Protons = Atomic number of the element a) Ag = 47 electrons b)…

Q: Which of the following subshells does not exist in atoms? * 6s O 2d O 4d 3p 5f O O O

A:

Q: 7 excited state. The atom then emits a photon, The Li2+ion is originally in the n = transitioning to…

A: Given  :  Initial state of Li+2 (n) = 7  Energy of emitted photon = 11.1057 eV

Q: xt Arial lonization energy refers to the amount of energy needed to remove an electron from an atom…

A: Ionization energy it is the amount of energy required to remove the most loosely bound electron/…

Q: This energy diagram shows the allowed energy levels of an electron in a certain atom. (Note: the SI…

A: Answer:Here, h is called as Planck's constant and c is the speed of light.

Q: This energy diagram shows the allowed energy levels of an electron in a certain atom. (Note: the SI…

A: •Here energy level diagram of an atom is given.We have to interpret various answers of questions…

Q: Astronomers observe spectra of planetary nebulae to learn about the stars that created them, and to…

A: The spectra of planetary nebulae are fundamentally different from those of stars. Instead of a…

Q: 5. The minimum energy needed to break an oxygen-oxygen bond in ozone is 387 kJ/mol. Does a photon…

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Q: The work function (binding energy) is the energy that must be supplied to cause the release of an…

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Q: Consider the diagram, shown below, representing a six carbon atom cyclic benzene molecule with six…

A: When a particle is confined inside a ring it can be considered analogous to a particle in a…

Q: Which orbital would the electron of a ground state hydrogen atom occupy? 1) 1s 2) 2p 3) Os 4) 1p 5)…

A: Solution: Given a hydrogen atom. Determine which orbital would the electron of a ground state…

Q: 1Who was the first scientist to include electrons in the atomic model?   Dalton   Bohr   Thomson…

A: Here, we have to find: the first scientist to include electrons in the atomic model what control…

Q: a) According to the Bohr model for a hydrogen atom, what is the energy di erence between the ground…

A: The objective of the question is to calculate the energy difference between the ground state and the…

Q: ledu.co Question 16 of 16 In Einstein's photoelectric experiment, the kinetic energy (K.E.) of an…

A: The kinetic energy of an electron is the difference between the energy of incident photon and the…

Q: 7. The following shapes each represent an orbital of an atom in a hypothetical universe. The small…

A: Principal quantum number, n is related to the size that is average distance from the nucleus, and…

Q: What is meant by the term electron density?

A: Electron density is a representation of the probability of finding an electron in a specific…

Quantum Chemistry

Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned towards the application of physical concepts towards various chemical aspects such as, formation of atoms, chemical structure descriptions, chemical bond strength, hybridization, conjugation etc. Quantum chemistry mainly studies the various states i.e., ground state, excited state, transition states of the individual atoms or molecules taking place during any chemical reaction. The laws of motion explained by various scientists, which are termed as “classical mechanics” were not acceptable in terms of electrons, protons, atoms, light etc. Thus, a new theory named “quantum mechanics” emerged to understand the basic framework of various atomic and subatomic particles.