(b) A certain element has two naturally occurring isotopes. The mass of one of the isotopes is 106.905 amu and its natural abundance is 51.60%. The mass of the second isotope is 108.883 amu. Calculate the average atomic mass Write the chemical symbols of the isotopes

Q: Should the elemental symbol for lead be written as Pb or PB? What confusion could arise if the wrong…

A: Elemental symbol for lead is Pb and it should be Pb .

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A:

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Q: Describe the law of constant composition?

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Q: 3.00 x 1023 atoms

A: Mass of Ca = 20.0 g Molar mass(MM) of Ca = 40.08 g Moles of Ca = Mass/MM     = 20.0/40.08   = 0.500…

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Q: Main-group elements are those in the columns 3A to 8A of the Periodic Table. True or Flase?

A: Representative elements are known as main group elements of the periodic table.

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A: Given that -  Mass of strontium nitrate =  5 g  Mass of water Increases due to exposed in air = 1.70…

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A: Concept is based on mole concept

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A:

Q: What is the molar mass of the compound with the formula X2Y2Z7, where X is an alkali metal from the…

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A: (a)

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A:

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A: The atomic weights of H and O are 1.00794 g and 15.9994 g respectively. Weights of atoms are…

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A:

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Q: Which of the following elements is not a representative element? O Nickel Cadmium Silicon O Barium

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Q: What is the mass occupied by 2.3 X 10 6Smolecules of Oxygen gas?

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A: Valence electrons are the electrons present in the outermost shell.

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A: The most resemple element of calcium atom is magnesium and Strontium.

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A: The example is given below:

Q: What would be the mass, in kilograms, of a block of graphite consisting of 1.55 x 1026 carbon atoms?

A:

Q: Which element is represented by the following symbol A. Chromium B. germanium C. barium D. iron

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.