Description : (2) experience collision less frequently Explanation: When an electric field is applied, both the valence electrons and the free electrons move in the same direction. The hole direction is opposite to that ... to free electrons. This means mobility is also less for a hole compared to free electron.
Last Answer : Carbon dioxide is called a greenhouse gas because - (1) its concentration remains always higher than other gases (2) it is used in photosynthesis (3) it absorbs infrared radiation (4) it emits visible radiation
Description : From the elements: Cl, Br, F, O, Al, C, Li, Cs and Xe; choose the following: (a) The element with highest negative electron gain enthalpy. (b) The element with lowest ionization enthalpy. ( ... . (f)The element which belongs to zero group. (g) The elements which forms largest number of compounds.
Last Answer : Ans. (a). The element chlorine (Cl) has the highest negative electron gain enthalpy. (b). The element cesium (Cs) has lowest ionization enthalpy. (c). The element fluorine F has lowest atomic radius. (d ... zero group (or group 18). (g). The element carbon (C) forms the largest number of compounds.
Description : For conductors, the free electrons will exist at a) Valence band b) Middle of valence and conduction band c) Will not exist d) Conduction band
Last Answer : d) Conduction band
Description : The emission of beta particle is from A)The valence shell of an atom B)The inner shell of an atom C)The nucleus due to the nuclear conversion `:` Prot
Last Answer : The emission of beta particle is from A)The valence shell of an atom B)The inner shell of ... to the nuclear conversion neutron `to` proton + electron
Description : Number of conduction electrons per unit volume is A. electron number B. number density C. proton number D. neutron numbe
Last Answer : number density
Description : The number of electrons, present in the valence shell of carbon of carbanion bearing `-ve` charge, is:
Last Answer : The number of electrons, present in the valence shell of carbon of carbanion bearing `-ve` charge, is: A. 8 B. 7 C. 6 D. 4
Description : The number of electrons present in the valence shell of carbon of `CH_(3)overset(+)(C)H_(2)` ion bearing `+ve` charge:
Last Answer : The number of electrons present in the valence shell of carbon of `CH_(3)overset(+)(C)H_(2)` ion bearing `+ve` charge: A. 8 B. 7 C. 6 D. 4
Description : How many electrons are in the valence shell of I in IF4-?
Last Answer : Need answer
Description : Valence electrons are the electrons found on the last shell of an atom true or fase?
Last Answer : TRUE
Description : Which one of the following elements has valence electrons in the n = 3 shell? A beryllium B oxygen C silicon D neon E hydrogen
Last Answer : C silicon
Description : How many electrons are there in the valence shell of the O2– ion? A 2 B 8 C 10 D 16 E 18
Last Answer : B 8
Description : How many electrons are there in the valence shell of a calcium atom?
Last Answer : ANSWER: 2
Description : Intrinsic semiconductor material is characterized by a valence shell of how many electrons? a) 1 b) 2 c) 4 d) 6
Last Answer : Intrinsic semiconductor material is characterized by a valence shell of 4 electrons.
Description : (3) the number of electrons orbiting around the nucleus Explanation: The chemical behavior of an atom is determined by the number of electrons on its outer shell. As for the chemical bonding properties of ... , and in what ratio atoms will bond to form the 20,000,000 different substances on Earth.
Last Answer : Methyl phenyl ether can be obtained by reacting - (1) phenolate ions and methyl iodide (2) methoxide ions and bromobenzene (3) methanol and phenol (4) bromobenzene and methyl bromide
Description : A characteristic of the noble gases is that they all: w) have eight electrons in the outer shell x) have low stability y) form many compounds z) have filled outer electron shells
Last Answer : ANSWER: Z -- HAVE FILLED OUTER ELECTRON SHELLS
Description : Five valence electrons of `.^(15)P` re labelled as If the spin quantum numbers of B and Z is `+(1)/(2)`, the group of electron with three of the quant
Last Answer : Five valence electrons of `.^(15)P` re labelled as If the spin quantum numbers of B and Z is `+(1)/(2)`, ... A. AB,XYZ,BY B. AB C. XYZ,AZ D. AB,XYZ
Description : In molecule of calcium sulfide calcium has two valence electron bonds and a sulfur atom has six valence electrons. How many lone pairs of electrons are present in the Lewis structure of calcium?
Last Answer : What is the answer ?
Description : How does energy of core electrons compare with the energy of valence electron?
Last Answer : The energy is higher.
Description : Which electron has seven valence electrons?
Last Answer : Any element in the halogen group will have seven valence electrons. These elements include fluorine, chlorine, bromine, iodine, and astatine.
Description : In a conductor – (1) there is no conduction band (2) the forbidden energy gap is very wide (3) the forbidden energy gap is very narrow (4) the valence band and the conduction band overlap each other
Last Answer : (4) the valence band and the conduction band overlap each other Explanation: In the case of a conductor, there is no forbidden energy gap. The conduction and valence energy bands overlap ... , the electrons from the valence band can freely enter the conduction energy band. Conduction energy band
Description : In a conductor (1) there is no conduction band (2) the forbidden energy gap is very wide (3) the forbidden energy gap is very narrow (4) the valence band and the conduction band overlap each other
Last Answer : the valence band and the conduction band overlap each other
Description : By the transition of inner shell electrons in heavy atoms, high energy photons are emitted which are a) gamma rays b) X-rays c) radio waves d) photon rays
Last Answer : b) X-rays
Description : Which one of the following statements concerning elements in the Periodic Table is correct? A Elements of the same group all have the same number of electrons in the outermost occupied electron shell. B ... (Group 17) are all gases at room temperature. E The Group 13 elements are all metals.
Last Answer : D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron
Description : Electron transport and phosphorylation can be uncoupled by compounds that increase the permeability of the inner mitochondrial membrane to (A) Electrons (B) Protons (C) Uncouplers (D) All of these
Last Answer : B
Description : What happens to the electrons of a gallium-arsenide semiconductor when they move from the normal low-energy conduction band to the high-energy conduction band?
Last Answer : The electrons become immobile.
Description : Conduction band electrons have more mobility than holes because they (1) are lighter (2) experience collision less frequently (3) have negative charge (4) need less energy to move them
Last Answer : experience collision less frequently
Description : What term is used to describe the definite discrete amounts of energy required to move an electron from a low shell to a higher shell?
Last Answer : Quanta.
Description : Insulators have (A) A full valence band. (B) An empty conduction band. (C) A large energy gap. (D) All the above.
Last Answer : (C) A large energy gap.
Description : What is difference between valence electron and free electron?
Last Answer : valence electrons are bound to atoms and are used to bind atoms into molecules. free electron are free, either they are in the conduction band "electron gas" of a metal or they are in a vacuum (perhaps in a vacuum tube).
Description : Total no. of vacant orbitals in valence shell of sulphur when it undergoes formation of `SF_(4)` :-
Last Answer : Total no. of vacant orbitals in valence shell of sulphur when it undergoes formation of `SF_(4)` :- A. 5 B. 4 C. 3 D. 2
Description : The valence shell configuration of noble gases (except He) is
Last Answer : The valence shell configuration of noble gases (except He) is A. `ns^(2)np^(4)` B. `ns^(2)np^(1)` C. `ns^(2)np^(6)` D. `ns^(2)np^(6)nd^(10)`
Description : If the valence shell electronic configuration of an element is 3s^2 3p^1, in which block of the periodic table is it placed?
Last Answer : If the valence shell electronic configuration of an element is 3s2 3p1, in which block of the periodic table is it placed?
Description : If the valence shell electronic configuration is ns^2 np^5, the element will belong to :
Last Answer : If the valence shell electronic configuration is ns2 np5, the element will belong to : a. ... halogens c. alkaline earth metals d. actinides
Description : The group which has completely filled valence shell is
Last Answer : eighteen.
Description : When radiation breaks an electron pair bond in a molecule and each fragment of the molecule gets one of the bond electrons, the molecular fragments that are formed are called: w) ions x) free radicals y) stable molecules z) gases
Last Answer : ANSWER: X -- FREE RADICALS
Description : The mass of an electron in motion depends upon - (1) Direction of motion (2) B its velocity (3) C its velocity of e- (4) D it’s shell number
Last Answer : (2) B its velocity Explanation: The electron has a mass that is approximately 1/1836 that of the proton. Quantum mechanical properties of the electron include an intrinsic angular momentum (spin) of a half-integer value, expressed in units of the reduced Planck constant, ħ.
Description : Which of the following statements is incorrect? (a) Electrons move toward positively charged locations. (b) An electron-rich atom is called an electrophile. (c) An electrophile is electron loving. (d) A nucleophile has a a pair of electrons it can share
Last Answer : An electron-rich atom is called an electrophile.
Description : Electrons move at right angles to a magnetic field of `1.5xx10^(-2)` Tesla with a speed of `6xx10^(7)m//s`. If the specific charge of the electron is
Last Answer : Electrons move at right angles to a magnetic field of `1.5xx10^(-2)` Tesla with a speed of `6xx10^ ... C//kg`. The radius of the circular path will be
Description : After electrons leave photosystem II, they move through a chain of three protein complexes. Where do they go after that electron transport chain?
Last Answer : Photosystem I (APEX)
Description : Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer cannot take place (A) Between two bodies in physical contact ... of a body to the another part of the same body (D) Both 'b' & 'c'
Last Answer : (B) Between two bodies not in physical contact with each other
Description : The majority charge carriers in p-type silicon are (A) Free electrons (B) Ions (C) Conduction electrons (D) Holes
Last Answer : Option D
Description : The energy required to remove the electron from the outermost shell from a free and isolated atom of the element is called
Last Answer : Ionisation energy.
Description : Electrons in the highest energy level of an atom are called _______. (1) valence protons (2) orbital protons (3) valence electrons (4) orbital electrons
Last Answer : (3) valence electrons Explanation: The outermost orbital shell of an atom is called its valence shell, and the electrons in the valence shell are valence electrons.
Description : What's a valence electron?
Last Answer : www.wikipedia.com/Valence_electron
Description : What is the valence electron of fluorine ?
Last Answer : The valence of fluorine is seven.
Description : What is the valence electron of phosphorus ?
Last Answer : Phosphorus valence electron 5 .
Description : What is the valence electron of nitrogen ?
Last Answer : Nitrogen valence is 5 electrons .
Description : How many of the following properties of halogen Increases with increase In atomic number. (a) Number of valence electron (b) Metallic nature (c) Boili
Last Answer : How many of the following properties of halogen Increases with increase In atomic number. (a) Number of ... . (j) `Delta_"eg"H` (magnitude wise)