Which of the following has been identified as the missing element in the earths core by scientists recently?

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Q: 43 (Current Affairs-JAN/2017)

Which of the following has been identified as the ‘missing element’ in the earth’s core by scientists recently?

question_subject: 

Geography

stats: 

0,100,144,58,32,100,54

keywords: 

{'magnesium': [1, 0, 2, 3], 'aluminium': [1, 0, 3, 2], 'element': [0, 0, 0, 1], 'manganese': [2, 0, 0, 1], 'core': [2, 0, 2, 8], 'silicon': [0, 0, 1, 0], 'earth': [0, 1, 1, 1], 'scientists': [2, 2, 8, 11]}