Question

The elements whose atoms have outer most and penultimate shells incomplete are called​

Answer 1

Answer:

Actinides

Explanation:

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Answer 2

Answer:

14 elements from atomic number 58 (Cerium) to 71(Lutetium) are called as Lanthanides and the another 14 elements from atomic number 90 (Thorium) to 103(Lawrencium) are called as Actinides. ... These elements have outermost three shells incomplete