Description : Within a given period of the periodic table, the element with the lowest ionization energy is: w) transition metal x) alkali metal y) halogen z) noble gas
Last Answer : ANSWER: X -- ALKALI METAL
Description : I will be describing a chemical element. Try to identify it with the fewest number of clues. This chemical element is the most abundant of the rare-earth group. The element is a silver-gray metal ... factor in color television tubes. The atomic number of this element is 58. What is this element?
Last Answer : ANSWER: CERIUM (Ce)
Description : I will be describing a chemical element. Try to identify it with the fewest number of clues. This element is a halogen wh is a liquid at standard conditions. The element volatilizes readily at ro ... . The atomic number of this element is 35 and its chemical symbol is Br. Name this element.
Last Answer : ANSWER: BROMINE
Description : The elements in group 1A of the periodic table are called: w) halogens x) alkaline earths y) alkali metals z) rare earths
Last Answer : ANSWER: Y -- ALKALI METALS
Description : Which of the following properties is not true for an alkali metal? (a) Low electronegativity (b) Low ionisation energy (c) Low atomic volume (d) Low density
Last Answer : Ans:(c)
Description : An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is– (1) 17 (2) 19 (3) 36 (4) 53
Last Answer : (2) 19 Explanation: Mass Number = number of protons (atomic number) + nu.sriber of neutrons. So as per the question, 36= number of neutrons + 17. Number of neutrons= 36 -17= 19
Description : An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is (1) 17 (2) 19 (3) 36 (4) 53
Last Answer : 19
Description : Which halogen has the largest atomic radius:
Last Answer : ANSWER: ASTATINE
Description : The halogen with the largest atomic radius is: w) Cl x) I y) Br z) At
Last Answer : ANSWER: Z -- At
Description : The correct statement (s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: Fe = 26, Ni = 28)
Last Answer : The correct statement (s) regarding the binary transition metal carbonyl compounds is (are) (Atomic ... the oxidation state of the metal is increased
Description : Which element is in the alkali metal family?
Last Answer : Lithium (Li) APEX
Description : What is a halogen element ?
Last Answer : The cunt elements in the seventh class of the periodic table (16th class according to the modern periodic table) are called halogen.
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)
Description : If atoms of a halogen nonmetal (Group 17) gain one electron, the atoms then have?
Last Answer : This atom become an anion with negative charge -1.
Description : f-block elements are also called (a) Alkali metals (b) Inner transition elements (c) Transition elements (d) Transuranic elements
Last Answer : Ans:(b)
Description : An Element Atomic number 17 and mass number 36, then number of neutrons present in it–
Description : An Element Atomic number 17 and mass number 36, then number of neutrons present in it
Description : I will be describing a chemical element. Try to identify it with the fewest number of clues. This chemical element is a silver-white metal, with bluish tinge, capable of taking a high polish. T element ... crust and used to make drink cans. The atomic number of this element is 13. Name t element.
Last Answer : ANSWER: ALUMINUM
Description : How does the atomic and Ionic Radii of alkaline earth metals vary in comparison to alkali metals
Last Answer : Ans The atomic and ionic radii of the alkaline earth metals are smaller than those of the corresponding alkali metals in the same periods. This is due to the increased nuclear charge in these elements. Within the group, the atomic and ionic radii increase with increase in atomic number.
Last Answer : The atomic and ionic radii of the alkaline earth metals are smaller than those of the corresponding alkali metals in the same periods. This is due to the increased nuclear charge in these elements. Within the group, the atomic and ionic radii increase with increase in atomic number.
Description : How the atomic and ionic radii varies in alkali metals
Last Answer : The atomic and ionic radii of alkali metals increase on moving down the group i.e., they increase in size while going from Li to Cs.
Description : What element in the 5th period is not a transition metal?
Last Answer : These elements are: Rb, Sr, Cd, In, Sn, Sb, Te, I, Xe.
Description : Rare gases are - (1) Mono atomic (2) di atomic (3) tri atomic (4) none of above
Last Answer : (1) Mono atomic Explanation: The so-called "rare" gases Neon (Ne), Krypton (Kr) and Xenon (Xe), are present in air in very low concentrations.
Description : What is the number of electrons in the last shell of a halogen element ?
Last Answer : : The number of electrons in the last shell of halogen elements is 5 .
Description : Among the elements of the 3rd period from Na to Ar, pick out the element: (L-2) (a). with highest first ionization enthalpy. (b). with largest atomic radius. (c). that is most reactive non-metal. (d). that is most reactive metal.
Last Answer : (a). Ar has highest first ionization enthalpy. (b). Na has large atomic radius (covalent radius). (c). Cl is more reactive non-metal in 3rd period. (d). Na is most reactive metal in third period.
Description : The element known as solid halogen?
Last Answer : Iodine
Description : What is a rare soil element ?
Last Answer : The 14 elements from the sixth stage of Ceram ( Ce) to Lutetium ( Lu) in the sixth stage of the periodic table are called lanthanides or rare earth elements. They are rarely found in nature.
Description : What is alkali metal ?
Last Answer : The first class elements of a periodic table are called alkali metals.
Description : Arrange the following in order of the increasing covalent character : MCl,MBr,MF,MI ( Where M=alkali metal)
Last Answer : Ans. MF < MCI < MB < MI
Description : when an alkali metal dissolves in liquid ammonia, the solution can acquire different colors. Explain .
Last Answer : Ans. The dilute solutions of alkali metals in liquid ammonia exhibit dark blue color because ammoniated electrons absorb energy corresponding the red region of the visible light. However, If the ... copper-bronze and the solution acquires metallic luster due to the formation of metal ion clusters.
Description : Which alkali metal has the highest ionic radii ?
Last Answer : Ans.Cs.
Description : Which alkali metal will have highest hydration enthalpy ?
Last Answer : Ans. Li
Description : When a cation is highly polarizing ? Which alkali metal cation has the highest polarizing power ?
Last Answer : Ans. A cation is highly polarizing if its charge/size ratio is very high.Li+ has the highest polarizing power .
Description : Name the alkali metal which forms only the normal oxide on heating with air ?
Last Answer : Ans. Li.
Description : Name the alkali metal which shows diagonal relationship with Mg?
Last Answer : Ans.Li
Description : Give point of resemblance of hydrogen with alkali metal.
Last Answer : Ans: 1 like alkali metals hydrogen also has one electron in its valence shell 2 like alkali metals hydrogen loses its only electron to form proton(H+) 3 like alkalis metals hydrogen ... the same way as alkali metals are librated at the cathode during the electrolysis of their fused halides
Description : Give reason for the appearance of colour in alkali metal halides.
Last Answer : Due to F-centres.
Description : Which one of the following best defines the word allotropes ? A Different structural forms of an element B A pair of substances that differ by H+ C Elements that possess properties intermediate between ... a specific number of neutrons E The different phases (solid, liquid or gas) of a substance
Last Answer : A Different structural forms of an element
Description : A gaseous organic compound that is best known for its use in preservative solutions has the chemical formula HCHO (read: H - C - H CHEM-92; Short Answer: Give me the name and atomic number ... element is a clear, odorless gas. This element is one of the essential ingredients in the burning process.
Last Answer : ANSWER: OXYGEN ATOMIC NUMBER = 8
Description : What is the transition element ? What is a transition element ?
Last Answer : The last electron of the element that enters the d orbital is called d block element. The elements whose d orbital electrons are partially full d (1-9) are called transition elements.
Description : A hydrogen like atom (atomic number `z`) is in a higher excited state of quantum number `n`. This excited atom can make a transition to the first exci
Last Answer : A hydrogen like atom (atomic number `z`) is in a higher excited state of quantum number `n`. This ... eV` respectively. Determine the value of `(n+z)`
Description : A hydrogen like atom (atomic number Z) is in a higher excited state of quantum number n. The excited atom can make a transition to the first excited s
Last Answer : A hydrogen like atom (atomic number Z) is in a higher excited state of quantum number n. The excited ... . (lonization energy of H-atom = 13.6 eV)
Description : Explain the following , giving reason . (a) Transition metal and many of their compounds show paramagnetic behavior (b) The enthalpy of atomisation of the transition metal is high . (c) The Transition metal generally form coloured compounds .
Last Answer : Ans(a) It is due to unpaired electrons . (b) It is due to strong metallic bond and additional Covalent bonds due to presence of unpaired electron in d- orbitals (c) It is due to presence of unpaired electrons ,they undergo d-d transition .
Description : Why are transition metal fluorides are ionic in nature where as chlorides and bromides are covalent in nature .
Last Answer : Ans - It is because of fluorine is most electronegative where as Cl and Br are less electro negative . Greater the difference in electro negativity more will be ionic character .
Description : Atomic mass of Nitrogen is 14 and that of Hydrogen is 1. What will be the molecular mass of Ammonia? (1) 18 (2) 17 (3) 16 (4) 15
Last Answer : (2) 17 Explanation: Ammonia (NH3) is composed of one atom of Nitrogen and three Hydrogen atoms. This means that its molar mass of ammonia will be the sum of the molar mass of one nitrogen atom and three times the molar mass of a hydrogen atom.
Description : The most intense line in the Brackett series of the spectrum of atomic hydrogen is the transition :-
Last Answer : The most intense line in the Brackett series of the spectrum of atomic hydrogen is the transition :- A. `n_(2)=ooton_ ... (1)=4` D. `n_(2)=4ton_(1)=3`
Description : Which Gas is used in the preparation of Soft drinks? A. Oxygen B. Carbon dioxide (Answer) C. Nitrogen D. Halogen
Last Answer : B. Carbon dioxide (Answer)
Description : 0.257g of organic substance was heated with conc. sulphuric acid and then distilled with excess of strong alkali .the ammonia gas evolved was absorbed in 50ml of .1M HCl which required 23.2ml of c for neutralization at the end of the process. Determine the % of nitrogen in the compound ?
Last Answer : A. Vol of 0 .1M HCl taken = 50ml Vol of .1MNaOH used for neutralization of unused acid=23.2ml Now, 23.2 ml of .1MNaOH =23.2ml of .1MHCl Vol of .1MHCl unused=23.2ml Vol of .1MHCl required ... NH3 solution contain nitrogen = 14*26.8/10*1000 Percentage of Nitrogen=14*26.8*100/10*1000*.257 =14.6%
Description : Name the gas liberated when alkali metals react with dil acid?
Last Answer : The alkaline earth metals readily react with acids liberating dihydrogen gas . M + 2HCl →→MCl2 + H2
Description : Is hydrogen a rare element in the universe as a whole?
Last Answer : No. Its the most common.