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4. STRUCTURE OF THE ATOM
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For the following statements, write $T$ for True and $F$ for False.
$(a)$ J.J. Thomson proposed that the nucleus of an atom contains only nucleons.
$(b)$ A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.
$(c)$ The mass of an electron is about $\frac {1}{ 2000}$ times that of proton.
$(d)$ An isotope of iodine is used for making tincture iodine, which is used as a medicine.
A
$(a)-(T)\;;\;(b)-(F)\;;\;(c)-(T)\;;\;(d)-(F)$
B
$(a)-(F)\;;\;(b)-(T)\;;\;(c)-(T)\;;\;(d)-(F)$
C
$(a)-(F)\;;\;(b)-(F)\;;\;(c)-(T)\;;\;(d)-(F)$
D
$(a)-(T)\;;\;(b)-(F)\;;\;(c)-(F)\;;\;(d)-(T)$
Solution
$(a)$ False
$(b)$ True
$(c)$ True
$(d)$ False
Standard 9
Science
Similar Questions
Complete the following table.
| Atomic Number | Mass Number | Number of Neutrons | Number of Protons | Number of Electrons | Name of the Atomic Species |
| $9$ | – | $10$ | – | – | – |
| $16$ | $32$ | – | – | – | sulphur |
| – | $24$ | – | $12$ | – | – |
| – | $2$ | – | $1$ | – | – |
| – | $1$ | $0$ | $1$ | $0$ | – |
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