Advertisements
Advertisements
Question
How does the existence of isotopes contradict Dalton’s atomic theory?
Solution
- 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
RELATED QUESTIONS
Fill in the blank
The ..........................of an atom is very hard and dense.
Multiple Choice Questions
The number of electrons in an atom is equal to number of
Complete the table below by identifying A, B, C, D, E and F.
FILL IN THE BLANK
The protons and neutrons are held firmly in the nucleus by strong .........................
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
State Dalton's atomic theory.
On the basis of Rutherford's model of an atom, which subatomic particle is present in the nucleus of an atom?
State one major drawback of Rutherford's model.
Name the following:
The element which does not contain any neutron in its nucleus.
‘Electrons revolve around the nucleus in fixed orbits or shells called energy levels’. State how these energy levels are represented.
