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प्रश्न
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
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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
Define:- Radicals
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Fill in the blank
If an atom gains an electron, it is called an _______
Fill in the blank
A deficiency of electrons produces a ________ charge.
How many times is a proton heavier than an electron?
What value has been given to the mass of this reference atom ?
The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
What is the contribution of the following in atomic structure?
Maharshi Kanada
In what respects do the three isotopes of hydrogen differ? Give their structures.
Draw the diagrams representing the atomic structures of the following: Neon
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
Define the following term with an example.
Element
Rewrite the given sentence in correct form.
Elements contain two or more kind of atoms and compounds contain only one kind of atom.
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.
The volume occupied by 4.4 g of CO2 at S.T.P ______
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
Lead is also known as plumbum.
