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प्रश्न
The basic unit of matter is ______.
विकल्प
element
atom
molecule
electron
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उत्तर
The basic unit of matter is atom.
APPEARS IN
संबंधित प्रश्न
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
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
Name three inert gases.
ANSWER IN DETAIL
How are isobars different from isotopes ?
Write the names of the elements present in the :-
Sulphuric acid
Define: Relative atomic mass
Name the particles which revolve around the nucleus.
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
Write the full form of IUPAC.
Name the unit in which the radius of an atom is usually expressed.
How many times is a proton heavier than an electron?
State two observations which show that atom is not indivisible.
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Define the following term:
Atom
The electron shell ______ is nearest to the nucleus.
Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
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 basic unit of matter is not capable of independent existence.
K: Potassium:: C: ______.
In all atoms of an element
An element is composed of ______ atoms.
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
- Rutherford’s atomic model
- Thomson’s atomic model
- Bohr’s atomic model
______ is a substance that is made up of three oxygen atoms chemically combined.
What is the fundamental particle of an element?
The ______ are combination of atoms of various elements or the same element.
The first scientific theory about atoms was given by J J. Thomson.
