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प्रश्न
Which of the following statement is correct about the atom of an element ?
विकल्प
an atom can have only protons and neutrons but no electrons.
an atom can have only electrons and neutrons but no protons
an atom can have only electron and proton but no neutron
an atom must always have a proton, neutron and electron
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उत्तर
an atom can have only electron and proton but no neutron
An atom must have a proton and an electron, but it may not have a neutron.
For example, in hydrogen atom, there is 1 proton, 1 electron but no neutron.
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:-
Glucose
Define: Covalent bond
Who originated the word ‘atom’ ?
How did Neils Bohr visualise the atom ?
How is the size of an atom indicated ?
Write the relation between nanometre and metre.
How many times is a proton heavier than an electron?
What is an atom ? How do atoms usually exist ?
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Define the following term:
Atom
In what respects do the three isotopes of hydrogen differ? Give their structures.
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of phosphorus
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
Define – Atom.
Name the sub-atomic particles.
Define the following term with an example.
Compound
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
Lead is also known as plumbum.
