12. The folloing figure is the successive Ionization energy of some element 5.5

Question

12. The folloing figure is the successive Ionization energy of some element 5.5 5.0 4.5 4.0 3.5 3.0 2.5 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th Electron removed Figure 223 The energy required for the removal of successive electrons Predict which element should be? 13 Write the complete electron configurations of a) Mn b) S c) Mg e) Cu 14 In the periodic table, reading from left to right and top to bottom, the elements are arranged in order of A hnumber of protons in their nucleus. B the number of neutrons in their nucleus. Cincreasing relative atomic mass. D in creasing mass number 15 Which one of the following has the lowest A Boron B Beryllium D Carbon

Explanation / Answer

13.

(a) Electronic configuration of Mn is 1s22s22p63s23p63d54s2

(b) Electronic configuration of Mn (25) is 1s22s22p63s23p63d54s2

(c) Electronic configuration of S (16) is 1s22s22p63s23p4

(d) Electronic configuration of Mg2+ (12 - 2 = 10) is 1s22s22p6

(e) Electronic configuration of Fe3+ (26 - 3 = 23) is 1s22s22p63s23p63d5

14.

According to atomic number which is equal to number of protrons or number of electrons.

So, answer is option (A)

15.

The electronegativity trend in the periodic table is as follows:

Mg < Be < B < C

So, answer is option (C) Magnesium.

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