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प्रश्न
Define the following term with an example.
Element
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उत्तर
Element: It is a substance that cannot be broken down into simpler substance by chemical means
Ex.: Oxygen, Hydrogen, Gold & Helium.
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 SHORT ANSWER
Define an ionic compound.
Define: Ions
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
How is the size of an atom indicated ?
How many times is a proton heavier than an electron?
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Define the following term:
Atom
The electron shell ______ is nearest to the nucleus.
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.
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
State true or false. If false, correct the statement.
An atom is electrically neutral.
Draw the structure of an atom and explain the position of the sub-atomic particles.
Which of the following statements made by Dalton has not undergone any change?
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 graphite refill used is pencil is made of element called ______.
The most abundant type of atom is the universe is ______.
The ______ are combination of atoms of various elements or the same element.
