Choose the incorrect statement among the following:

Question

Choose the incorrect statement among the following: (A) All the actinoid elements are radioactive. (B) Alkali and alkaline earth metals are s-block elements. (C) Chalcogens and halogens are p-block elements. (D) The first member of the lanthanoid series is lanthanum.

Tardigrade Admin · Accepted Answer

Lanthanoids are 58Ce-71Lu ( 14 elements ). Electronic configuration of text57 textLa = [ textXe] text6s2 text5d1 and it is a d-block element.

Q. Choose the incorrect statement among the following:

All the actinoid elements are radioactive.

Alkali and alkaline earth metals are s-block elements.

Chalcogens and halogens are p-block elements.

The first member of the lanthanoid series is lanthanum.

Lanthanoids are $_58 C e -_{71} Lu$ ( $14$ elements ).
Electronic configuration of $_{57} La = [Xe] 6s^{2} 5d^{1}$ and it is a d-block element.

Q. Choose the incorrect statement among the following:

All the actinoid elements are radioactive.

Alkali and alkaline earth metals are s-block elements.

Chalcogens and halogens are p-block elements.

The first member of the lanthanoid series is lanthanum.

Lanthanoids are _58Ce−71​Lu ( 14 elements ). Electronic configuration of 57​La=[Xe]6s25d1 and it is a d-block element.

Lanthanoids are $_58 C e -_{71} Lu$ ( $14$ elements ).
Electronic configuration of $_{57} La = [Xe] 6s^{2} 5d^{1}$ and it is a d-block element.