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 : 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 : What Elements in order of increasing size sulfur silicon oxygen aluminum and neon?
Last Answer : Elements in order of increasing size of the covalent atomicradius: neon, oxygen, sulfur, silicon, aluminum.
Description : How many electrons are there in the valence shell of a calcium atom?
Last Answer : ANSWER: 2
Description : Which are the only two elements on the periodic table that are liquid at room temperature? A. Mercury and Bromine (Answer) B. Carbon and helium C. Nitrogen and Hydrogen D. Oxygen and Neon
Last Answer : A. Mercury and Bromine (Answer)
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 : Electrons which are free to move around are also called A. conduction electrons B. valence shell electrons C. inner electrons D. electron sea
Last Answer : conduction electrons
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 : Atoms of different elements have - (1) same atomic number and same electronic configuration (2) different atomic number and same eletronic configuration (3) different atomic number and different number of valence electrons (4) same number of electrons and neutrons
Last Answer : (3) different atomic number and different number of valence electrons Explanation: Each element's atoms have a different number of protons, neutrons, and electrons, which is why they have different ... Their reactivity also varies because of the number and activeness of the electrons in the atom.
Description : Atoms of different elements have (1) same atomic number and same electronic configuration (2) different atomic number and same eletronic configu-ration (3) different atomic number and different number of valence electrons (4) same number of electrons and neutrons
Last Answer : different atomic number and different number of valence electrons
Description : The elements present in the largest amounts in rocks and minerals are: 1. Silicon 2. Oxygen 3. Hydrogen 4. Gold The correct statements are: (a) 1 and 2 (b) 2 and 4 (c) 3 and 4 (d) 1 and 4
Last Answer : Ans:(a)
Description : In addition to hydrogen, the other abundant element present on Sun’s surface is - (1) Helium (2) Neon (3) Argon (4) Oxygen
Last Answer : (1) Helium Explanation: The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. All ... out of which it formed: the hydrogen and helium in the Sun were produced by Big Bang nucleosynthesis.
Description : In addition to hydrogen, the other abundant element present on Sun’s surface is (1) Helium (2) Neon (3) Argon (4) Oxygen
Last Answer : Helium
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 : What is the element required for solar energy conversion? (1) Beryllium (2) Tantalum (3) Silicon (4) Ultra pure carbon
Last Answer : (3) Silicon Explanation: The most prevalent bulk material for solar cells is crystalline silicon (abbreviated as a group as c-Si), also known as "solar grade silicon". Bulk silicon is ... into multiple categories according to crystallinity and crystal size in the resulting ingot, ribbon, or wafer.
Description : What is the element required for solar energy conversion ? (1) Beryllium (2) Tantalum (3) Silicon (4) Ultra pure carbon
Last Answer : Silicon
Description : All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent. (A) Deuterium (B) Hydrogen (C) Neon (D) Helium
Last Answer : (B) Hydrogen
Description : What are the valence electrons? For s-block and p-block elements show that number of valence electrons is equal to its group number.
Last Answer : What are the valence electrons? For s-block and p-block elements show that number of valence electrons is equal to its group number.
Description : In terms of valence electrons what is the different between metallic elements and nonmetallic elements?
Last Answer : Feel Free to Answer
Description : Do elements in the same family have the same number of valence electrons?
Last Answer : Yes, this is a general rule.
Description : Elements, like calcium, located toward the top of a group have a high attraction for their valence electrons because they have a _?
Last Answer : small atomic radius.
Description : How the elements beryllium carbon and oxygen produces stars such as the sun?
Last Answer : It is not specifically those elements which "produce stars".Whatever elements happen to be around clump together, throughgravity, and form the star.
Description : What are transition elements? (1) Elements whose two outermost shells are incomplete (2) Elements which possess properties of both, metals and non-metals (3) They have eight electrons in the outermost shell (4) Elements whose three outermost shells are incomplete
Last Answer : (1) Elements whose two outermost shells are incomplete
Description : Which of the 3rd period elements loses electrons most readily? w) Sodium x) Magnesium y) Aluminum z) Silicon
Last Answer : ANSWER: A-SODIUM
Description : The element required for Solar energy conversion - (1) Beryllium (2) Silicon (3) Tantalum (4) Ultra pure carbon
Last Answer : (2) Silicon Explanation: Energy conversion. n. (General Physics) is the process of changing one form of energy into another, such as nuclear energy into heat or solar energy into electrical energy.
Description : What is the element required for solar energy conversion ---? A. Ultra pure carbon B. Silicon (Answer) C. Beryllium D. Tantalum
Last Answer : B. Silicon (Answer)
Description : Elements with eight electrons in their outermost shell are called
Last Answer : noble gases
Description : Atomic number of which of the following elements is greater than that of Fluorine? (1) Sodium (2) Beryllium (3) Nitrogen (4) Boron
Last Answer : (1) Sodium Explanation: Sodium has higher atomic number (11) than Fluorine (9) The atomic number of Beryllium and Nitrogen are 4 and 7 respectively.
Description : Lithium and beryllium, shows similarity with which elements .
Last Answer : Lithium shows similarities to magnesium and beryllium to aluminium in many of their properties. This type of diagonal similarity is commonly referred to as diagonal relationship in the periodic table.
Description : Which of the following elements is not an alkaline earth metal? w) beryllium x) barium y) calcium z) rubidium
Last Answer : ANSWER: Z -- RUBIDIUM
Description : Which of the following elements forms a tetrahedra structure? w) carbon x) beryllium y) boron z) fluorine
Last Answer : ANSWER: W -- CARBON
Description : Difference between Valency and Valence electrons ? -Chemistry
Last Answer : 1 ) Valency : The ability to gain, loose and sharing of electrons is valency / combinig capacity atoms of other elements is valency. 2 ) Valence elctrons : Electrons present in the outermost shell of the atom is valence electrons.
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 : 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 : How many valence electrons does an atom of an element with an atomic number of twelve have?
Last Answer : ANSWER: TWO
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 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 : 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 : Which is a semiconductor: copper, silicon, or neon?
Last Answer : Copper is a metal. Silicon is a semiconductor. Neon is inert gas.
Description : The sun is made up of 99.9% of -------- and -------? A. Oxygen and Hydrogen B. Hydrogen and Sulfur C. Carbon and Silicon D. Hydrogen and Helium (Answer)
Last Answer : D. Hydrogen and Helium (Answer)
Description : Which one of the following elements exhibits the greatest tendency to lose electrons? (1) Fluorine (2) Lithium (3) Oxygen (4) Zine
Last Answer : (2) Lithium Explanation: Alkali metals such as Lithium are the most electropositive elements in the periodic table. As alkali metals have low ionization energies, they have a great tendency to lose electrons forming unipositive ions.
Description : Which one of the following elements exhibits the greatest tendency to lose electrons ? (1) Fluorine (2) Lithium (3) Oxygen (4) Zinc
Last Answer : Lithium
Description : Which of the following is not a noble gas? (1) Hydrogen (2) Helium (3) Neon (4) Argon
Last Answer : (1) Hydrogen Explanation: The noble gases are the chemical elements in group 18 of the periodic table. This chemical series contains helium, neon, argon, krypton, xenon, and radon.