Define atomic mass.
Chlorine has two stable isotopes ,` Cl-35` and `Cl-37 `with atomic masses` 34.968u`and `36.956u` respectively . If the average atomic mass is `35.453u` , calculate the percentage abundance.

An element has two isotopes of mass numbers 65 and 67 with abundances of 25 % and 75 % respectively. The atomic mass of the elements is

Boron has two isotopes with atomic masses 10 and 11. If its average atomic mass is 10.81, the abundance of lighter isotope is________.

Chlorine, bromine and iodine form a Dobereiner's triad . Chlorine has atomic mass 35.5 and iodine has atomic mass 126.9 . Predict the atomic mass of bromine.

The natural isotopic abundace of ^10B is 19.60 % and ^11B is 80.40 %. The exact isotopic masses are 10.13 and 11.009 respectively. Calculate the average atomic mass of boron.

The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39 respectively. a. Calculate the average atomic mass of element B according to Dobereiner's triads. b. Compare the average atomic mass of B with its atomic mass. c. What could the elements A, B and C be?

Chlorine has two isotopes, viz. Cl-35 and Cl-37 Their atomic masses are 35 and 37. Their chemical properties are same. Where should these be placed in Mendeleev's periodic table? In different places or in the same place?

Boron has two stable isotopes, .^(10)B (19%) and .^(11)B (81%). The atomic mass that should appear for boron in the periodic table is ___________.

Calculate the binding energy of "_3 ^ 7 Li , the masses of hydrogen and lithium atoms being 1.007825u and 7.016u respectively

Atomic mass of ._16^32S in 31.97 u.If masses of neutron and H atom are 1.0078 u respectively.What is the mass defect?