All atoms of an element are identical.

Amongst the following statements, select the set having statements which was porposed by Dalton. (1) All the atoms of a given element have identical properties including identical mass. Atoms of different elements differ in mass. (2) When gases combine or reproduced in a chemical reaction they do so in a simple ratio by volume provided all gases are at the same T & P (3) Chemical reaction involve reorganization of atoms. These are neither created nor destroyed in a chemical reaction. (4) Matter consists of indivisible atoms

Account for the following : Isotopes of an element possess identical chemical properties.

All atoms of an element differ from each other.

Atomic mas of an element is :

Atomic mass of an element is

An atom of an element is represented as ""_12^24A . Write the number of protons present in one atom of the element.

In which of the following molecules all A - X bond lengths are identical? [A = central atom and X = surrounding atom]

Write all possible oxidation states of an element having atomic number 25 .

The line spectrum of two elements is not identical because :

Assertion : The order of atomic radii of Cu, Ag and Au is Cu lt Ag ~~ Au . Reason : The atomic radii of 4d series elements are larger than those of 3d series elements but generally the radii of 4d and 5d series elements are almost identical.