Tag: discovery of subatomic particles

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Multiple choice chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

An atom does not carry any electric charge because it _____________.

  1. has an equal number of charged and non charged particles

  2. has neutrons in their nuclei

  3. has an equal number of electrons and protons, hence positive and negative charge gets neutralized.

  4. has an equal number of neutrons and protons
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Equal number of negatively charged electrons and positively charged protons would give a neutral atom which would thus not have any electric charge.

Multiple choice chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

Which of the following has negative charge and is present in atom as pairs with opposite spin?

  1. Proton

  2. Neutron

  3. Electron

  4. Isotope

  5. Ion
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Option $C$ is the correct answer.

An electron is a negatively charged particle. In an orbital, if two electrons are present together, they should and must have opposite spins. Because, no two electrons can be identically same.

Multiple choice chemistry atom fundamental particles of an atom the structure of atoms discovery of subatomic particles

The ratio of the neutrons present in nitrogen atom and a silicon atom is: 

(Mass number of nitrogen and silicon is 14 and 28 respectively)

  1. 7 : 3

  2. 3 : 7

  3. 1 : 2

  4. 2 : 1
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For nitrogen; atomic number = 7 and mass number = 14 

$\therefore$ Number of neutrons $= 14-7 = 7$
For silicon; atomic number = 14 and mass number = 28 
$\therefore$ number of neutrons $= 28-14= 14$
$\therefore$ Ratio of number of neutrons in nitrogen and silicon $= 7:14 = 1:2$