Q3 of 17 Page 24

The mass number of an atom is 31. The M shell of this atom contains 5 electrons.

Draw the Bohr model of the atom.

The atom as mentioned in the question is that of the phosphorus atom as it is having an atomic number 15 with 15 electrons and protons and 16 neutrons.

The Bohr model of the atom is –



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3

The mass number of an atom is 31. The M shell of this atom contains 5 electrons.

What is the atomic number of this atom?

 3

The mass number of an atom is 31. The M shell of this atom contains 5 electrons.

How many neutrons does this atom have?

 4

Bohr models of atoms A, B, C, D are given (Symbols are not real).

a) Write the atomic number, mass number and electronic configuration of the atoms,


b) Among these, which are isotxopes? Why?



 5

Symbols (not real symbols) of some atoms are given.


Find the atomic number and mass number of these elements.