La(Lanthanum ) having atomic number 57 is a member of Share with your friends Share 1 Abhishek Dwivedi answered this La (Lanthanum) is a d block element. As it is present in 6th period 3rd group. The atomic number of Lanthanum is 57) 0 View Full Answer Yashika Kothari answered this La Lanthanum is a d block element. As it is present in 6th period 3rd group. The atomic number of Lanthanum is 57.So the correct option is (c) 1
