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Structure Of Atom

Question

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Mass number of an element is 27 and number of protons is 13. Calculate the number of electrons, neutrons and atomic number.

Solution

Here number of protons = 13
Number of electrons = 13
Atomic number = Number of protons = 13
Number of neutrons = Mass No. (A) - At. No. (Z) = 27- 13= 14

Some More Questions From Structure of Atom Chapter

What is the name of the remaining part of atom except outer orbit?

Name the particles which determine the mass of an element.

What are α-particles?

Why were neutrons discovered very late?

What are the fundamental particles present in a neutral atom having atomic number greater than 1?

Do protons and neutrons have identical mass?

When α-particles are sent through a thin metal foil, most of them go straight through the foil. What inference do you draw from it?

What did Rutherford's experiment on scattering of particles show for the first time?

What is Plum-Pudding model of the atom?

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