Description : atomic mass unit is equal to?
Last Answer : 1.6605 x 104-27 Kg
Description : If edge length of an unit cell `=4xx10^(-8)` cm and the unit cell is a face-centered cubic with atomic mass of metal is 40 then density of the unit ce
Last Answer : If edge length of an unit cell `=4xx10^(-8)` cm and the unit cell is a face-centered cubic with atomic mass of ... /(24) `gm/ml D. `(1)/(4)` gm/litre
Description : That can he the reason for choosing Carbon12 to define atomic mass unit?
Last Answer : That can he the reason for choosing Carbon12 to define atomic mass unit?
Description : Why is the atomic mass unit rather then the gram usually used to express atomic mass?
Last Answer : Because a gram is too large a unit to express the mass of anatom. Also the Atomic Mass relates to what atoms or made of.If you convert the atomic mass into grams you have a mole of theelement.
Description : Energy equivalent to one atomic mass unit (amu) is __________ MeV. (A) 9.31 (B) 93.1 (C) 931 (D) 9310
Last Answer : (C) 931
Description : 1. What is the number of electrons in an atom of atomic number Z and mass number A? 2. With which of the following fields is M. F. Hussain associated? 3. Which is the Slack Season' in ... 19. What are Shield volcanoes? 20. Mughal dynasty was to Bahadur Shah Zafar-as what was Lodi dynasty to?
Last Answer : Answer : 1. Z 2. Painting 3. Jan.-June 4. Australia 5. Valanadu 6. Stomata 7. 9th December, 1946 8. Measuring flask 9. China 10. Rajaraja Chola I 11. Vocal music 12. Abidjan 13. ... N. Rao 17. By radiation only 18. Useful but need strict regulation 19. Repeated lava flows 20. Ibrahim Lodi
Description : The SI base unit for mass is-------? A. Gram B. Pound C. Kilogram (Answer) D. Ounce
Last Answer : C. Kilogram (Answer)
Description : Coulomb is the scientific unit to measure? A. Velocity B. Temperature C. Mass D. None OF These (Answer)
Last Answer : D. None OF These (Answer)
Description : Cusec is a unit of -----? A. Area B. Time C. Distance D. mass E. None of these (Answer)
Last Answer : E. None of these (Answer)
Description : A light year is a unit of ? A. Time B. Energy C. Length (Answer) D. Mass
Last Answer : C. Length (Answer)
Description : An element X has a mass number 4 and atomic number 2. Write the valency of this element? -Science
Last Answer : Mass number = 4 Atomic number = 2 X is Helium. It has 0 valency and it will not react with any other atom because it has its outer shell filled.
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 : The correct statement is (a) Two Isotones always have the same atomic number (b) Two isotopes always have the same mass number (c) Two isobars always have the same atomic number (d) Two isobars always have the same mass number
Last Answer : Ans:(d)
Description : There are two elements calcium (atomic number 20) and argon (atomic number 18) The mass number of both the elements is 40. They are therefore known as (a) isotones (b) isochores (c) isobars (d) isotopes
Last Answer : Ans:(c)
Description : Which one of the following is the most characteristic property of an element? (a) Density (b) Boiling point (c) Mass number (d) Atomic number
Description : Evidence for the existence of energy level in atom is supplied by (a) Atomic numbers (b) Atomic radii (c) Spectral lines (d) Mass defects
Description : The mass number of a nucleus is (a) Always less than its atomic number (b) The sum of the number of protons and neutrons present in the nucleus (c) Always more than the atomic weight (d) A fraction
Last Answer : Ans:(b)
Description : What is the modern standard for rela- tive atomic mass?
Last Answer : Carbon isotope with mass number 12
Description : Simplest atom (based on atomic mass) is that of?
Last Answer : Hydrogen
Description : Elements having same mass number and different atomic number are known as?
Last Answer : Isobars Eg: calcium — 40; Argon - 40
Description : Atoms of the same element having same atomic number and different mass number are known as?
Last Answer : Isotopes
Description : The Russian chemist who said that the properties of elements are periodic function of their atomic mass is
Last Answer : Dmitri Mendeleev.
Description : The person in 1815 who suggested in that elements can be classified on the basis of atomic mass was
Last Answer : William Prout.
Description : Atomic mass is not useful to construct the periodic table. Give reasons with an example. OR Why is atomic number is more useful than atomic mass to classify the elements?
Last Answer : Isotopes of an element have same atomic number but different atomic mass. They have to be placed in four places. This creates confusion because other elements occupied these positions.
Description : The atomic masses of three elements X, Y and Z having similar chemical properties are 7, 23 and 39 respectively. a) Calculate the average atomic mass of elements X and Z. b) How is the ... this example? d) Give another example of a set of elements which are classified according to this law.
Last Answer : a) The average atomic mass of X and Z = 7 39 2 46 2 23 b) The average atomic mass of X and Z is equal to the atomic mass of Y c) The law illustrated in this example is Dobereiner’s law of triads. d) Another example of Dobereiner’s law is Calcium, Strontium and Barium.
Description : In a triad A, B and C, the atomic masses of A and B are 80 and 120 respectively. What is the atomic mass of element C?
Last Answer : Atomic mass of A=80 Atomic mass of B=120 A C 2 Atomic mass of B = 80 C 2 120x2 80 C 120 240 C 80 C 240 80 C 160
Description : What is the number of electrons in an atom of atomic number Z and mass number A? -Do You Know?
Last Answer : answer:
Description : What is the atomic number and mass ?
Last Answer : Be Atomic number 4 and mass 9
Description : What is the atomic mass of hydrogen ?
Last Answer : Atomic mass of hydrogen 1.
Description : What is the atomic mass of titanium ?
Last Answer : Atomic mass of titanium 48
Description : What is the relative atomic mass of scandium ?
Last Answer : The relative atomic mass of scandium is 45 .
Description : What is the relative atomic mass of calcium ?
Last Answer : The relative atomic mass of calcium is 40 .
Description : What is the relative atomic mass of potassium ?
Last Answer : : Atomic mass relative to potassium 39 .
Description : What is the relative atomic mass of argon ?
Last Answer : The relative atomic mass of argon is 40 .
Description : What is the relative atomic mass of chlorine ?
Last Answer : The relative atomic mass of chlorine is 35 .
Description : What is the relative atomic mass of sulfur ?
Last Answer : The relative atomic mass of sulfur is 32 .
Description : What is the relative atomic mass of phosphorus ?
Last Answer : The relative atomic mass of phosphorus is 30 .
Description : What is the relative atomic mass of silicon ?
Last Answer : Relative atomic mass of silicon 28 .
Description : What is the relative atomic mass of aluminum ?
Last Answer : Relative atomic mass of aluminum 27 .
Description : What is the relative atomic mass of magnesium ?
Last Answer : The relative atomic mass of magnesium is 24 .
Description : What is the relative atomic mass of sodium ?
Last Answer : Relative atomic mass of sodium 23 .
Description : What is the relative atomic mass of neon ?
Last Answer : Relative atomic mass of neon 20 .
Description : What is the relative atomic mass of fluorine ?
Last Answer : The relative atomic mass of fluorine is 19 .
Description : What is the relative atomic mass of oxygen ?
Last Answer : Relative atomic mass of oxygen 16 .
Description : What is the relative atomic mass of nitrogen ?
Last Answer : Relative atomic mass of nitrogen 14 .
Description : What is the relative atomic mass of carbon ?
Last Answer : Relative atomic mass of carbon 12 .
Description : What is the relative atomic mass of beryllium ?
Last Answer : : Relative atomic mass of beryllium 9 .
Description : What is the relative atomic mass of lithium ?
Last Answer : The relative atomic mass of lithium is seven.
Description : What is the relative atomic mass of helium ?
Last Answer : The relative atomic mass of helium is four.
Description : What is the relative atomic mass of hydrogen ?
Last Answer : The relative atomic mass of hydrogen is one.