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प्रश्न
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
उत्तर
Dalton’s atomic theory states that atoms are indivisible. This statement is not valid as, atoms can be further divided into electrons, protons and neutrons. This is one of the major drawbacks of Dalton’s atomic theory of matter.
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संबंधित प्रश्न
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
ANSWER IN DETAIL
How are isobars different from isotopes ?
Define:- Radicals
Write the names of the elements present in the following compound.
Common salt
Write the names of `"Ca"("NO"_3)_2` compounds :
Fill in the blank
An ion with positive charge is called ______
Name the particles which revolve around the nucleus.
Define: Covalent bond
An atom has 13 protons and 14 neutrons.
How many electrons would be present in this atom ?
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
Define the following term:
Atom
Electron, proton, neutron are the types of ______ in an atom.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
K: Potassium:: C: ______.
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
Which of the following statements made by Dalton has not undergone any change?
Atoms of one element can be transmuted into atoms of other elements by ______
Write any two observations which support the fact that atoms are divisible.
