12. Which of the statements below BEST describes the elements in the region A? A A. Known as lanthanide series B. All of them able to form covalent bonds C. The elements able to donate at least one electron D. Most of the element have high electronegativity

Q: ELEMENT X HAS AN ATOMIC NUMBER OF 9 1. How many atomic orbitabls does atom X have? 2. How many…

A: Given, Atomic no. = 9  then,

Q: State the periodic table. How does the periodic law correlate with electronic structure?

A: Given 1,)  State the periodic table 2.)  How does the periodic law correlate with electronic…

Q: Choose the statement that explains the difference between the first ionization energy of first…

A: We have to compare the ionization energy of the F-atom and F2 molecules.

Q: 1. Show that the mean velocity of an electron in an electron gas at the absolute zero of temperature…

A:

Q: 25) Which nonradioactive group I metal would be the most reactive in water and why? A) Cesium would…

A: 25) Cesium belongs to group I of the periodic table having only one electron in the outermost shell.…

Q: Which of the following would have the largest radius? a. O2- b. Mg2+ c. F- d. B3+

A:

Q: What happens as the two atoms approach each other ? (a) Each electron is attracted by the nucleus of…

A:

Q: conducting electrons O free electrons O band electrons O valence electrons

A:

Q: Most metals are solids except for which is a 3. 4. Most non-metals are solids or gases except for…

A:

Q: How does the electron structure of an isolated atom differ from that of a solid material? Select the…

A: The electron structure of an isolated atom differ from that of solid state in the following ways: In…

Q: Until the early 1960s the group 8A elements were called the inert gases; before that they were…

A: (a) The term inert is used for the unreactive elements which are not involved in any reactions. Some…

Q: 13. Describe what is London Dispersion forces, Dipole-Dipoie bonds. 14. What is the difference in PE…

A: Hi, as you have posted multiple questions and have not mentioned which question you want us to solve…

Q: Question 1: A. Given the following elements: N and O a) Write the electronic configuration of each…

A: a)Electronic configuration: N (GS) 1s2 2s2 2p3, where in excited statenon of the s electron will…

Q: 8. Find the key characteristic of redox reactions. * O A. The reactions fixed electron…

A:

Q: MCQ 99: The highest melting point in Group-II elements is of A. Be B. Ba C. Ca D. Mg

A: * Group ll are alkaline earth metal  * As we move down the group  atomic radius increases, hence…

Q: An unknown ionic compound is made of a monoanion and a monocation who both have the same electronic…

A: The arrangement of the electrons in the different atomic orbital of an atom is known as the…

Q: WHAT IS THE ELEMENT: a) of Group 4A, with the most metallic character b) of Group 5A which forms the…

A:

Q: (b) List some properties of Group 1 elements which indicate they are all metals. (c) What valence do…

A: Here we have to write some properties of group 1 metal, valency of group 1 elements and name and…

Q: What types of elements undergo covalent bonding? a. a nonmetal and a metal b. two Group 1 elements…

A:

Q: Explain why Be and Mg form metallic hydrides instead of ionic hydrides like the other elements in…

A: Be and Mg forms metallic hydrides instead of ionic hydrides and the two possible reasons are their…

Q: Write the long form electron configuration for phosphorous

A:

Q: Until the early 1960s, the group 8A elements were calledthe inert gases. (a) Why was the term inert…

A: (a) The term inert is used for the unreactive elements which are not involved in any reactions. Some…

Q: The last orbital of element Y’s electronic configuration is defined by the following set of quantum…

A:

Q: Why the ionization energy of noble gases is high? * Because they have a stable configuration Because…

A: The ionization energy of noble gases is high because they have a stable configuration.

Q: 14. The illustration below shows two atoms of a fictitious element (M) forming a diatomic molecule.…

A:

Q: Which drawing depicts the electron configuration of oxygen (g O)? A. В. C. D. E.

A: Electrons are filled in a different atomic orbital in an atom. According to the Aufbau rule, the…

Q: 2. Electron configurations a. Write the electron configuration and orbital diagram for Co. Identify…

A:

Q: 12. 13. • . 17 protons |||| ● I || H ● Li .Be. B. Na Mg. AI Si : Ar .. K .Ca. • Ga Ge . As Se : Kr…

A: For question 12, we have to find the elements that will form a bond. For question 13, we have to…

Q: An element X reacts with F2(g) to form the molecular productshown here. (a) Write a balanced…

A:

Q: 12. Why does Li have a larger first ionization enengy than Na? OA Because Li has only 3 electrons…

A: Ionization energy :-  The amount of energy required to remove an electron from an isolated neutral…

Q: state phosphorus atom? Select one: а. 4 b. 1 С. 2 d. 3 Clear my choice

A: Concept is based on electronic configuration.

Q: 13. The electron configuration of Argon (Ar) differ from those of Chlorine (CI) and Potassium (K) by…

A: The electronic configuration of the given elements are

Q: ELEMENT X HAS AN ATOMIC NUMBER OF 9 How many atomic orbitabls does atom X have? How many shells do…

A:

Q: Galium (Ga) is an element in group III with atomic number 31. By referring to the Periodic Table,…

A: Gallium, Ga is a fourth period element. Here, d-orbital contraction means scandide contraction…

Q: 8. A mixture of sand and NH4CI can be separated by method. 9. Define latent heat of fusion. Give its…

A: 8.    Sublimation     Sublimation is the process by which a solid substance on heating converts…

Q: Galium (Ga) is an element in group III with atomic number 31. By referring to the Periodic Table,…

A: Since you have posted question with multiple subparts as per guidelines we can answer three . So ,…

Q: Which one has the largest ionic radius? O 0²- OMg2+ Nat OF

A:

Q: Explain why valence electrons are more important than core electrons in determining the reactivity…

A: The electrons in the innermost shell are called the core electrons while the electrons in the…

Q: E is a made up element and contains 6 valence electrons Calculate the number of valence electrons in…

A: The number of valence electrons in E3  = Valence electrons in a E x 3 = 6 x 3 = 18

Q: 24 A molecule is made from four atoms. The first atom (A) has four valence electrons, the second…

A: Lewis structure represents the valence shell electrons in a compound. It shows the distribution of…

Q: How atmospheric haloes were formed?

A: Clouds in sky are made of crystals of ice. Ice is solid state of water. Water exist in three states-…

Q: Sulphur reacts with carbon and potassium separately to form compound P and compound Q. (a) Draw an…

A: Sulfur(S) is more electronegative than both carbon(C) and potassium(K).  Hence S accepts electrons…

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.