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प्रश्न
How is the size of an atom indicated ?
उत्तर
The size of an atom is indicated by its radius.
APPEARS IN
संबंधित प्रश्न
MATCH THE COLUMNAS
| 1. Jpham Dalton | a. Neutrons |
| 2. Atom | b. Model of the atom |
| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
| 5. Protons | e. Electricity neutral |
| 6. Nuclear fusion | f. Generator of electricity |
| 7.Gamma -rays | g. High penetrating power |
| h.Energy in sun |
Write the names of the elements present in the :-
Sulphuric acid
Define: Relative atomic mass
Name the particles which revolve around the nucleus.
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Write the relation between nanometre and metre.
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.
(Atomic masses : Al = 27 u ; Fe = 25 u)
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
Select the correct answer to the statement given below:
The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
Rewrite the given sentence in correct form.
Elements contain two or more kind of atoms and compounds contain only one kind of atom.
State true or false. If false, correct the statement.
An atom is electrically neutral.
An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.
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 1 mole of a diatomic gas at S.T.P is ______
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportions
The smallest unit of an element is ______.
The first scientific theory about atoms was given by J J. Thomson.
