Tag: chemistry

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Multiple choice chemistry the structure of the atom discovery of charged particles the plum pudding atom discovery of electrons and protons

The fraction occupied by nucleus in an atom is:

  1. $1/10^{-10}$
  2. $1/10^8$
  3. $1/10^{-5}$
  4. $1/10^5$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Radius of atom $\displaystyle  = 10^{-10}$ m
Radius of nucleus $\displaystyle  = 10^{-15}$ m
The fraction occupied by nucleus in an atom $\displaystyle  = \dfrac {10^{-15}}{10^{-10}}=\frac {1}{10^5}$
Multiple choice chemistry the structure of the atom discovery of charged particles the plum pudding atom discovery of electrons and protons

Which of the following elements has maximum density of nucleus?

  1. ${ { _{ 14 }{ Si } } }^{ 30 }$
  2. ${ { _{ 15 }{ P } } }^{ 31 }$
  3. ${ { _{ 8 }{ O } } }^{ 16 }$

  4. All have same desity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
 $Element$  $Atomic$ $number$$(A)$  $Atomic$ $mass$ $number$$(Z)$ no. of proton (A) no. of neutron(2A-Z)
 $Si$  14  30  14  16
 $P$  15  31 15  16 
 $O$  8  16  8  8

The element containing greater number of proton and neutron has greater density, phosphorus has highest density as compared to others.

$P>Si>O$

Multiple choice chemistry the structure of the atom discovery of charged particles the plum pudding atom discovery of electrons and protons

The size of nucleus is of the order of 

  1. ${10^{ - 12}}\;{\text{m}}$
  2. ${10^{ - 8}}\;{\text{m}}$
  3. ${10^{ - 15}}\;{\text{m}}$
  4. ${10^{ - 10}}\;{\text{m}}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The order of magnitude of the radius of an atomic nucleus is typically measured in femtometers (or fermis), which is 10^-15 meters. In contrast, 10^-10 meters is the order of atomic size, and 10^-8 meters is molecular scale.