Advertisements
Advertisements
प्रश्न
How does the existence of isotopes contradict Dalton’s atomic theory?
Advertisements
उत्तर
- Atoms are not indivisible, they can be further divided into fundamental particles electrons, protons and neutrons.
- Every atom of an element is not identical. Isotopes are the atoms of same element with same atomic number but different mass number, that means they have same number of protons and electrons but differ in their number of neutrons.
APPEARS IN
संबंधित प्रश्न
Give the following a suitable word/phrase.
The number of protons present in the nucleus of an atom.
FILL IN THE BLANK
The protons and neutrons are held firmly in the nucleus by strong .........................
Tick the most appropriate answer
Which one of the following scientists put forward the theory regarding the extra-nuclear structure of the atom?
- James Chadwick
- John Dalton
- Rutherford
- Niels Bohr
Tick the most appropriate answer.
Which of the following is used as a coolant in nuclear reactor?
- liquid sodium
- liquid nitrogen
- cadmium steel rods
- plutonium
TRUE \ FALSE
Uranium-235 and uranium-238 both undergo nuclear fission.
WRITE SHORT ANSWER
What is the central part of an atom known as?
ANSWER IN DETAIL
How are radioactive radiations useful in medicines ?
On the basis of Rutherford's model of an atom, which subatomic particle is present in the nucleus of an atom?
What are nucleons? How many nucleons are present in phosphorus? Draw its structure.
What is meant by the term nucleus
