Question

) a) Write two postulates of Bohr's model of an atom..
b) Write the number of electrons and valency of magnesium​

Answer 1

Answer:

(a) Each orbit or shell has a fixed energy and these circular orbits are known as orbital shells. The energy levels are represented by an integer (n=1, 2, 3…) known as the quantum number. ... shells and when an electron attains the lowest energy level, it is said to be in the ground state.

(b) electrons :12

Valency:2

Explanation:

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Answer 2

Answer:

The electrons revolving around the nucleus are confined to certain fixed orbits called shells or energy levels ,each of which is associated with a fixed amount of energy. 2. While it is revolving around the nucleus in an orbit, an electron neither loses not gains energy.

Explanation:

Magnesium (Atomic number = 12) has electronic configuration 2, 8, 2. It loses 2 electrons to complete octet configuration in its valence shell.