Question

question 11 (1 point)
q11 - find the 5th period non - transition elements
cs, ba, tl, pb, bi, po, at, rn
li, be, b, c, n, o, f, ne
rb, sr, in, sn, sb, te, i, xe
k, ca, ga, ge, as, se, br, kr
question 12 (1 point)
q12 - find the lanthanide that is fifth in the list
plutonium
tin
promethium
vandium

Explanation:

Question 11:

The 5th period of the periodic table starts with Rb and ends with Xe. Non - transition elements are elements that are not d - block elements. Rb, Sr, In, Sn, Sb, Te, I, Xe are the non - transition elements of the 5th period. Cs and Ba are in the 6th period, Li - Ne are in the 2nd period, and K - Kr are in the 4th period.

Question 12:

Lanthanides are elements with atomic numbers 57 - 71. Plutonium is an actinide, Tin is a main - group element, and Vandium is a transition metal. Promethium (atomic number 61) is a lanthanide.

Answer:

Question 11: Rb, Sr, In, Sn, Sb, Te, I, Xe

Question 12: Promethium