Description : The elements of the third period of the Periodic Table are given below: periodic-classification-of-elements-chapter-wise-important-questions-class-10-science-1 (a) Which atom is bigger, Na or Mg? Why? (6) Identify the most (i) metallic and (ii) non-metallic element in Period 3. -Science
Last Answer : (a) Sodium is bigger than magnesium as it has lesser nuclear charge so there is less force of attraction between nucleus and valence electrons and less effective nuclear charge. It is, therefore, ... the most non-metallic element because it can gain electrons easily due to its smallest atomic size.
Description : 1The elements of the second period of the Periodic Table are given below: Li Be B C N O F (a) Give reason to explain why atomic radii decrease from Li to F. (b) Identify the most (i) metallic and (ii)non-metallic element. -Science
Last Answer : a) It is because nuclear charge increases due to increase in atomic number, therefore, force of attraction between nucleus and valence electrons increases, i.e. effective nuclear charge increases, hence ... element is ‘F’ because it can gain electrons easily due to smallest atomic size.
Last Answer : The elements are coin metal
Description : A radioactive element is preset in VIII group of the periodic table. If it emits one `alpha`particle, the new position of the nuclide will be
Last Answer : A radioactive element is preset in VIII group of the periodic table. If it emits one `alpha`particle, the new ... . VI B B. VIII C. VIIB D. I B
Description : An unknown element is a soft metallic solid. It is highly reactive and has a low melting point. In which group of the periodic table is it most likely to be found?
Last Answer : Sodium - group 1
Description : On going down in a group in the periodic table, the metallic nature of element
Last Answer : increases.
Description : A sulphate salt of group 2 element of the periodic table is white ,soft substance which can be moulded into different shapes by making its dough.Identify the salt . (a) CaSO4.1/2 H2O (b) CaSO4.2H2O (c) 2CaSO4. 1⁄2 H2O (d)CaSO4
Last Answer : (a) CaSO4.1/2 H2O
Description : Name this chemical element. The principal use of this element has been in solid-state electronic devices, notably transistors. Its position in the periodic table is in group "4A". The element's atomic number is 32 and its chemical symbol is Ge.
Last Answer : ANSWER: GERMANIUM
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 : The following statements concern elements in the periodic table. Which of the following is true ?
Last Answer : The following statements concern elements in the periodic table. Which of the following is true ? ... of +5 oxidation state increases down the group.
Description : What is the sign of Astatine ?
Last Answer : At Astatine's signal
Description : Which of the following is NOT a noble gas? w) radon x) xenon (pron: zee-non) y) astatine (pron: as-tah-teen) z) krypton
Last Answer : ANSWER: Y -- ASTATINE
Description : Which of the following elements would most likely be a silvery solid at room temperature? w) Sodium x) Silicon y) Selenium z) Astatine
Last Answer : ANSWER: W -- SODIUM
Description : Excluding Astatine, which halogen does NOT replace the other halogens from their compounds?
Last Answer : ANSWER: IODINE
Description : What element is not on the periodic table? -Riddles
Last Answer : The Element of Surprise.
Description : what is the 110 element of periodic table?
Last Answer : DS Darmstadtium
Description : What is the six element of the periodic table of elements?
Last Answer : Family six on the Periodic Table of elements is also know asChalcogens
Description : What is the signal of the last element of the periodic table ?
Last Answer : Uuo The last element of the periodic table.
Description : Which is the first element in the periodic table ?
Last Answer : The first element in the periodic table is hydrogen ( H) .
Description : What is the name of the last element of the periodic table ?
Last Answer : The last element of the periodic table is called Ogneson ( Og) .
Description : Which element of the periodic table has the highest value ?
Last Answer : Uranium has the highest value.
Description : (A) The position of an element an element in periodic in table after emission of one `alpha` and two `beta`-partilce remians unchanged. (R ) Emission
Last Answer : (A) The position of an element an element in periodic in table after emission of one `alpha` and two `beta` ... D. If both (A) and (R ) are incorrect.
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 : Which is the first element in the periodic table?
Last Answer : Which is the first element in the periodic table?
Description : How can chemists state with certainty that no one will discover an element that would appear on the periodic table?
Last Answer : Need answer
Description : What can you predict about an element from its position on the periodic table?
Last Answer : Its position predicts several useful characteristics:1. The no. of valence electrons/the type of valence orbitals2. The nature of element3. Other Elements having similar chemistry4. rough idea of the ionization enthalpy, electronegativity, andother parametersand many more things
Description : How did Mendeleev arrange the known element in his periodic table?
Last Answer : He arranged the elements in the increasing order of their atomicmasses and repeating periodic properties.
Description : What is Name an element in the periodic table that you would expect to chemically similar to sulfur?
Description : The first element on the periodic table of elements is hydrogen?
Last Answer : is it true or false
Description : Helium (He), neon (Ne) and argon (Ar) are all colorless, odorless gases with low chemical reactivity. Based on the periodic table, which other element would also have those same properties?
Last Answer : Helium
Description : Which is the heaviest element in the periodic table?
Last Answer : who introduced the first Periodic Table
Description : First element in the periodic table?
Last Answer : Hydrogen
Description : (a). Which is largest in size- Cu+ , Cu+2, Cu and why? (b). which element in the periodic table has the highest ionization enthalpy? (c). Which element is more metallic in the periodic table.?
Last Answer : Ans. (a). Cu is largest due to less effective nuclear charge. It has 29 electrons, 29 protons, Cu+ has 28 electrons and 29 protons, Cu2+ has 27 electrons and 29 protons. (b). He has highest ionization enthalpy. (c). Mg is more metallic due to lower ionization energy
Description : The element which is the most reactive of all elements in the periodic table is
Last Answer : fluorine.
Description : What is the first element in the periodic table? A. Hydrogen (Answer) B. Helium C. Nitrogen D. Carbon
Last Answer : A. Hydrogen (Answer)
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 : Name the chemical element that is eleventh in the Lanthanide Series in the periodic table. Because of the metal's high thermal-neutron-absorption cross section, it has been of much interest in terms of use in nuclear reactor hardware. The chemical symbol for this element is Er.
Last Answer : ANSWER: ERBIUM
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 : The element I am thinking about has several interesting characteristics. It occupies the same column in the periodic table as lead. Resistors which are commonly found in electronic circuits are often made out ... element is one of the hardest substances on earth. What element am I thinking about?
Last Answer : ANSWER: CARBON
Description : The position of three elements A, B and C in the periodic table shown below: a) State whether A is a metal or non-metal. b) State whether C is more reactive or less reactive than A. c) Will C be larger or smaller in size than B?
Last Answer : a) Metals lie on the left side where as non-metals are B C placed on the right side of the periodic table. Group 17 is on the right side of the periodic table, thus element A is non-metal ... size decreases moving from left to right along a period. So atom C will be smaller in size than B.
Description : (a) What are groups' and periods' in the periodic table'? (b) Two elements M and N belong to group I and II respectively and are in the same period of the periodic ... Sizes of their atoms Their metallic characters Their valencies in forming oxides Molecular formulae of their chlorides -Science
Last Answer : (a) The vertical columns in the periodic table are called groups'. The horizontal rows in the periodic table are called periods'. (b) M' and N' belong to same period but group I ... oxides. Valency goes on increasing first and then decreases. MCI, NCI2 are molecular formulae of their chlorides.
Description : a) What is meant by periodicity in properties of elements with reference to the periodic table? (b) Why do all the elements of the same group have similar properties? (c) How will the tendency to gain electrons change as we go from left to right across a period? Why? -Science
Last Answer : (a) The repetition of same properties after definite interval is called periodicity in properties. (b) It is because they have same valence electrons therefore, have similar properties. (c) ... to right in a period because atomic size goes on decreasing and effective nuclear charge increases.
Description : What is the number of elements in the zero group of the periodic table ?
Last Answer : The number of elements in the zero group of the periodic table is 6 .
Description : Which group of periodic table have large negative energy of activation ?
Last Answer : Which group of periodic table have large negative energy of activation ? A. Alkali metal B. Zero group C. Halogen family D. Alkaline earth metal
Description : a. 1s^2 b. 1s^22s^22p^6 In which group and period of the periodic table they are placed?
Last Answer : The electronic configuration of some elements are given below : a. 1s2 b. 1s22s22p6 In ... and period of the periodic table they are placed?
Description : In which group of elements of the modern periodic table are halogen placed ?
Last Answer : In which group of elements of the modern periodic table are halogen placed? a. 17 b. 6 c. 4 d. 2
Description : La belongs to group 3 while Hg belongs to group 12 and both belong to period 6 of the periodic table.
Last Answer : La belongs to group 3 while Hg belongs to group 12 and both belong to period 6 of the ... from La to Hg together using orbital notation method.
Description : What Group is Pb (lead) in click for the periodic table?
Last Answer : Lead is in the group 14 of the Periodic Table.