Question

question 3 (1 point) q3 - find the rare earth metal with lowest atomic mass scandium lanthanum yttrium actinium question 4 (1 point) q4 - find the metal in group 7 and period 4 iron manganese cobalt chromium

Explanation:

For Q3, Scandium has the lowest atomic mass among the given rare - earth metals. Its atomic mass is approximately 44.96 u, while Lanthanum is around 138.91 u, Yttrium is about 88.91 u, and Actinium is around 227 u. For Q4, by referring to the periodic - table layout, the element in group 7 and period 4 is Manganese.

Answer:

Q3. Scandium
Q4. Manganese