Description : What shell will determine the atomic radius of carbon?
Last Answer : Feel Free to Answer
Description : Pick out the correct statement. (A) Loss of electrons from neutral atoms produces negative ions (B) The radius of nucleus & atomic size are of the order of 10 -12 cm & 10 - 8 cm respectively (C) Gain of electrons by neutral atoms form cations
Last Answer : (B) The radius of nucleus & atomic size are of the order of 10 -12 cm & 10 - 8 cm respectivel
Description : The ratio of atomic radius to its nuclear radius is about (A) 10 5 (B) 10 8 (C) 10 12 (D) 10 15
Last Answer : (A) 10
Description : The radius of a sphere measured repeatedly yields values 5.63 m, 5.54 m, 5.44 m, 5.40 m and 5.35 m. Determine the most probable value
Last Answer : The radius of a sphere measured repeatedly yields values 5.63 m, 5.54 m, 5.44 m, 5. ... radius and the mean absolute, relative and percentage errors.
Description : If a sample of pure sodium has a mass of 8.2 grams and sodium has an average atomic mass of 22.99 gmol how many sodium atoms are there in the sample?
Last Answer : Need answer
Description : What is Atomic Radius ?
Last Answer : Atomic radius measures the distance of the outer electron cell from the nucleus of the atom.
Description : Calculate the drift velocity for the electrons in a silver wire which has a radius of 0.1 cm and carries a current of 2 A. Atomic mass of silver=108 a
Last Answer : Calculate the drift velocity for the electrons in a silver wire which has a radius of 0.1 cm and carries a ... silver `=10.5xx10^(3) kg//m^(3)`.
Description : A beam of ultraviolet radius hacking wavelength between `100nm and 200nm` is inclined on a sample of atomic hydrogen gas. Assuming that the atoms are
Last Answer : A beam of ultraviolet radius hacking wavelength between `100nm and 200nm` is inclined on a sample of ... being observed by on atom in the ground state
Description : What is the element in period 4 with the smallest atomic radius?
Last Answer : What is the noble gas element with the largest radius
Description : Atomic radius _moving from left to right across a period?
Last Answer : Decreases
Description : The cause of periodicity of properties (a) Increasing atomic radius (b) Increasing atomic weights (c) Number of electrons in the valency orbit (d) The recurrence of similar outer electronic configuration
Last Answer : Ans:(d)
Description : Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has – (1) high bond dissociation energy (2) smaller atomic radius (3) stable half filled 2p sub level (4) high nuclear charge
Last Answer : (3) stable half filled 2p sub level Explanation: Ionization energy is a measure of the ease in which atoms lose electrons and become positive ions.
Description : In the periodic table of elements, on moving from left to right across a period, the atomic radius – (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pattern
Last Answer : (1) decreases Explanation: The atomic radius is the distance from the atomic nucleus to the outermost stable electron orbital in an atom that is at equilibrium. It tends to decrease across a period from ... usually increases while going down a group due to the addition of a new energy level (shell).
Description : Atomic size refers to the ______ of an atom. (1) Radius (2) Circumference (3) Diameter (4) Centre
Last Answer : (1) Radius Explanation: The term atomic size refers to the radius of an atom. The atomic size may be visualized as the distance between the centre of the nucleus and the outermost shell of an isolated atom.
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 : Why does atomic size (radius) decrease across a period?
Last Answer : The atomic radius decreases along a period because the atomic number increases by one, but the additional electron goes to the same shell.There is no change in the number of shells but more ... in closer to the nucleus which leads to contraction of the atom and thus decrease in atomic size
Description : The repetition of property after a certain interval called ------? A. Electron efinity B. Atomic radius C. periodicity of property (Answer) D. none of these
Last Answer : C. periodicity of property (Answer)
Description : Atomic __________ is a whole number for an element. (A) Number (B) Weight (C) Radius (D) None of these
Last Answer : (A) Number
Description : Atomic __________ of an element is a whole number. (A) Weight (B) Number (C) Volume (D) Radius
Last Answer : (B) Number
Description : Which of the following has the smallest atomic radius? w) iodine x) chlorine y) fluorine z) bromine
Last Answer : ANSWER: Y -- FLUORINE
Description : Of the following elements which has the largest atomic radius? w) Ba x) F y) C z) Be
Last Answer : ANSWER: W -- Ba
Description : Which of the following four elements has the largest atomic radius? Is it: w) strontium x) francium y) calcium z) bromine
Last Answer : ANSWER: X -- FRANCIUM
Description : As one goes across a period in the periodic table, the ionization energy generally increases for one of the following reasons. Is it because of the increasing w) atomic radius x) melting point y) nuclear charge z) density
Last Answer : ANSWER: Y -- NUCLEAR CHARGE
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 : In the periodic table of elements, on moving from left to right across a period, the atomic radius (1) decreases (2) increases (3) remains unchanged (4) does not follow a definite pattern
Last Answer : increases
Description : Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has (1) high bond dissociation energy (2) smaller atomic radius (3) stable half filled 2p sub level (4) high nuclear charge
Last Answer : stable half filled 2p sub level
Description : A circle is represented by center point [5,5] and radius 6 units. Find the parametricequation of circle and determine the various points on circle in first quadrant if increment in angle by 45o a.9.24,9.24 b.9.42,9.42 c.9,9 d.11,5
Last Answer : a.9.24,9.24
Description : What is the radius of the cylinder used to determine the ideal kilogram of mass measurement ?
Last Answer : The diameter of the cylinder is 1.95 cm.
Last Answer : Eratosthenes was the first to determine the exact radius of the earth.
Last Answer : I determined and what next? A circle inscribed in a triangle This is a circle that touches all sides of the triangle. The center of the circle inscribed in the triangle ABC is the intersection of the axes of the ... the 2nd series of the summer part of KMS 2009 / 2010.pdf example no.6" in Slovak
Description : Assuming that a planet goes round the sun in a circular orbit of radius `0.5AU` determine the angle of maximum elongation for the planet and its dista
Last Answer : Assuming that a planet goes round the sun in a circular orbit of radius `0.5AU` determine ... its distance from the earth when elongation is measured.
Description : An electron moves in a circular orbit of radius 10 cm with a constant speed of `4.0xx10^(6) ms^(-1)`. Determine the electric current at a point on the
Last Answer : An electron moves in a circular orbit of radius 10 cm with a constant speed of `4.0xx10^(6 ... Determine the electric current at a point on the orbit.
Description : If Ns=250, determine the earth radius k-factor. A. 1.98 B. 1.23 C. 1.33 D. 1.29
Last Answer : B. 1.23
Description : Determine the maximum shearing stress and elongation in a helical steel spring composed of 20 turns of 20-mm-diameter wire on a mean radius of 90 mm when the spring is supporting a load of 1.5 kN. and G = 83 GPa. a. 200 mm b. 105.4 mm c. 150 mm d. 250 mm
Last Answer : b. 105.4 mm
Description : Calculate the radius of the first and second orbit of sodium atom `(Z=11)`. `(h=6.6xx10^(-34) J s, e=1.6xx10^(-19) C` and `m=9.1xx10^(-31) kg.)`
Last Answer : Calculate the radius of the first and second orbit of sodium atom `(Z=11)`. `(h=6.6xx10^(-34) J s, e=1.6xx10^(-19) C` and `m=9.1xx10^(-31) kg.)`
Description : Making use of the tables of atomic masses, determine the energies of the following reaction: (a) `Li^(7)(p,n)Be^(7)` , (b)`Be^(9)(n,gamma)Be^(10)`, (c
Last Answer : Making use of the tables of atomic masses, determine the energies of the following reaction: (a) `Li^(7)(p,n)Be^(7 ... `, (d) `O^(16)(d,alpha)N^(14)`.
Description : Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number. -Science
Last Answer : Atomic number of sodium (Z) =11 Mass number of sodium (A) = 23 Number of protons in the nucleus = 11 Number of neutrons in the nucleus =23-11 = 12 Number of electrons = 11 Electronic ... the electronic configuration is 2, 8(K, L). However, the number of protons and neutrons remains the same.
Description : Lithium, sodium and potassium form a Dobereiner’s triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium. -Science
Last Answer : Lithium, sodium and potassium form a Dobereiner's triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium. Therefore, the atomic mass of sodium = average of the atomic mass of lithium and potassium = 23.
Description : What is the relative atomic mass of sodium ?
Last Answer : Relative atomic mass of sodium 23 .
Description : What is the atomic number of sodium ?
Last Answer : The atomic number of sodium is 11 .
Description : Is sodium hypochlorite binary or poly atomic?
Last Answer : Sodium hypochlorite has the formula NaClO and so is polyatomic.It has 3 different atoms (Na, Cl and O).
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 : The fuel in atomic pile is - (1) carbon (2) sodium (3) petroleum (4) uranium
Last Answer : (4) uranium Explanation: In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of ... other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
Description : An atomic clock is based on transitions in - (1) Sodium (2) Caesium (3) Magnesium (4) Aluminium
Last Answer : (2) Caesium Explanation: An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms ... the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
Description : The mercury and sodium street lamps light up because of – (1) Atomic emission (2) Atomic absorption (3) Electron emission (4) Electron absorption
Last Answer : (1) Atomic emission Explanation: The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter ... energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light.
Description : The sodium compound used as coolant in atomic reactors?
Last Answer : Liquid sodium
Description : Give reason: Atomic size of sodium atom is greater than that of chlorine atom.
Last Answer : Sodium is in the 1 st group where as chlorine is in 17 th group. We know that the atomic size decreases down the group. Hence sodium atom has larger atomic size than that of chlorine atom.
Description : An aqueous solution of sodium chloride is prepared by dissolving 10kg of sodium chloride in 50 kg of water find (i) Weight % (ii) Mole % of solution. [Atomic weight of Na = 23, Cl = 35.5]
Last Answer : Weight of NaCl = 10 kg Weight of H2O = 50 kg Total weight = 60 kg Weight % of NaCl = (10/ 60) * 100 =16.67% Weight % of H2O = (50/ 60) * 100 = 83.33% Molecular weight of NaCl = 58.5 k moles of NaCl ... 100 = 5.79% Mol % of H2O = (moles of H2O / Total moles)*100 = (2.78/ 2.949)*100 = 94.26%