Law of multiple proportions explains the formation of CO and CO2, in these same weight of carbon that combines with weights of oxygen are in simple rate of 1 : 2.
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportion
Which one of the following statement is not true ?
e.g., In 17Cl35 no. of p = 17 but no. of n = 35 – 17 =18
While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation ?
Members of which of the following have similar chemical properties ?
Which of the following is not a basic particle of an element?
Given mass number (Z) = 99
no. of neutrons = 56
∴no .of protons = atomic number = 99 – 56 = 43 i.e., 43Tc99
Which of the following has acharge of +1 and a mass of 1 amu ?
The number of electrons in an element with atomic number X and atomic mass Y will be
No. of electrons = no. of protons = Atomic number = X