a entsen..crvet ao..me Markl Answer the followings questions for the same elemen

Question

a entsen..crvet ao..me Markl Answer the followings questions for the same element 1 Now many electrons are present in an atom in which the first and second shells are [1 Mark] fled and the 3s subshell is half-flled? 1 Mark] 1 Mark] [1 Mark] (1 Mark] 2. White the name of the element. 3. Write the complete electron configuration for the identified element. 4. What is the atomic number of the identified element? s. Indicate the number of orbitals per sublevel for all shells 6. Indicate the number of the valence electron(s) and its location (1 Mark] 7. What is the oxidation state of the element? Is it cation or anion? 2 Mark] 8. Write the complete set of quantum numbers that represent the valence electron(s) for 12 Marks] the element. Page 2

Explanation / Answer

Ans 1 :

The first shell has only one subshell which has 2 electrons. The second shell has two sub shells s and p with 2 and 6 electrons respectively. The 3s orbital of third shell has 2 electrons , and when it is half filled , the total count of electrons become : 2+ 2+ 6 + 1 = 11 electrons

Ans 2 :

The name of the element will be sodium.

Ans 3 :

The complete electronic configuration is given as :

1s2 2s2 2p6 3s1

Ans 4 :

The atomic number resembles the number of electrons in a neutral atom . So the atomic number of the element will be 11.

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