Advertisements
Advertisements
प्रश्न
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
विकल्प
True
False
Advertisements
उत्तर
False
Correct statement: The basic unit of an element is atom.
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 |
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Write the names of the elements present in the:-
Ammonia
Fill in the blank
An ion with negative charge is called _______
Give the charge and the mass of an electron, proton and neutron present in an atom ?
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Write the full form of IUPAC.
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
Is it possible to see atoms these days ? Explain your answer.
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
What is the contribution of the following in atomic structure?
Maharshi Kanada
The basic unit of matter is ______.
A change in the physical state can be brought about
Write any two observations which support the fact that atoms are divisible.
An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.
Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges.
Statement II: Atoms of each element are stable and emit their characteristic spectrum.
In the light of the above statements, choose the most appropriate answer from the options given below:
