Which standard adapted for the determination of atomic weight of elements?

Define atomic number of an element?

Which instrument is used to accurate determination of atomic masses.

The vapour density of a chloride of an element is 39.5 . The equivalent mass of the element is 3.82 . The atomic weight of the element is

The method preferred for determining the molecular weight of polymer is:

1.00 g of a chloride of an element contains 0.835 g of chlorine. If the vapour density of the chloride is 85, find the atomic weight of the element and its valency.

Which of the following is not a merit of Mendeleev's original periodic table? a) Prediction of undiscovered elements and their properties b) Correction of atomic masses of a few elements c) Systematic arrangement of elements based on atomic mass d) Similar elements were placed in different groups e) Separate positions are given for isotopes f) Order of increasing atomic weight is not observed. The correct code is