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Atomic Number and Mass Number

65. B has two...

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65. B has two isotopes Boron 10 (19%) and Boron 11 (81%). The atomic mass of B is

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Q. Boron has two stable isotopes,

^{10} B (19 %)

^{11} B (81 %)

. Calculate average atomic mass of boron in the periodic table.

Boron has two stable isotopes,

^{10} B (19 %)

^{11} B (81 %)

. Average atomic weight for boron in the periodic table is:

Q. Boron has two isotopes B - 10 and B - 11. If the average atomic mass of boron is 10.80 u. What is the percentage of a heavier isotope?

Q. Boron occurs in the nature in the form of two isotopes

_{5}^{11} B

_{5}^{10} B

81 %

19 %

respectively. Calculate its average atomic mass.

Q. Boron has two isotopes,

^{10} B

^{11} B

whose relative abundances are

20

80

% respectively. Atomic weight of boron is:

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