Question

A Mars Rover discovered an element X. On analysis using Bohr’s atomic model, it was found that K and L shells of the given element were completely filled, whereas ten more electrons were required to fill M shell. Calculate the atomic number of element 'X'​

Answer 1

Answer:Bohr diagrams show electrons orbiting the nucleus of an atom somewhat like planets orbit around the sun. In the Bohr model, electrons are pictured as traveling in circles at different shells, depending on which element you have. Figure  2  contrast the Bohr diagrams for lithium, fluorine and aluminum atoms. The shell closest to the nucleus is called the K shell, next is the L shell, next is the M

Lithium has three electrons:

two go to K shell and

the remaining one goes to the L shell.

Its electronic configuration is K(2), L(1)

Fluorine has nine electrons:

two go to K shell and

the remaining seven go to the L shell.

Its electronic configuration is K(2), L(7). Note that L can have 8 electrons.

Aluminum has thirteen electrons:

two go to the K shell,

eight go to the L shell, and

remaining three go to the M shell.

Its electronic configuration is K(2), L(8), M(3). Note that the M shell can have 18 electrons.

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