11. The successive ionization energies of a certain element in period 5 are 577.9 kl/mol, 1x...

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Question

11. The successive ionization energies of a certain element in period 5 are 577.9 kl/mol, 1x = 1820 kl/mol, 13- 2750 kJ/mol,

science chemistry

Answer 1

Answer #1

There is huge difference in ionisation energy between IE3 and IE4.

This means, lots of energy are required to remove 4th electron.

So, after 3 electrons are removed, the element has acquired noble gas configuration,.

So, there are 3 valence electrons in the element.

The element with 3 valence electrons in period 5 is Indium

Answer: In

Answer 2

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