Which statement about the Rutherford model of the atom is not true?
There is a positively charged centre in an atom called the nucleus
Nearly all the mass of an atom resides in the nucleus
Size of the nucleus is comparable to the atom
Electrons occupy the space surrounding the nucleus
What is plum pudding model of the atom ?
The absorption transitions between the first and the fourth energy states of hydrogen atom are $3.$ The emission transitions between these states will be
To accommodate the view that matter is made up to $5$ elements only, a scientist proposed the following hypothesis; that atoms can have a maximum principal quantum number $n _{\operatorname{man}}$ and no higher. Then, which of the following statements must be true ?
What is the percentage of $\alpha -$ particles that have more than $1^o$ scattering in Geiger-Marsden experiment?
If in nature there may not be an element for which the principal quantum number $n > 4,$ then the total possible number of elements will be