Question

q7 - find the actinide with highest atomic mass
plutonium
hydrogen
uranium
lawrencium
question 8 (1 point)
q8 - find the metalloid in group 13
aluminum
silicon
carbon
boron

Explanation:

For Q7, actinides are a series of elements. Lawrencium (Lr) has the highest atomic - number among them and thus the highest atomic mass among the given actinides. Plutonium (Pu), Uranium (U) have lower atomic numbers. Hydrogen is not an actinide.
For Q8, in group 13 of the periodic table, boron is a metalloid. Aluminum is a metal, silicon is in group 14, and carbon is in group 14.

Answer:

Q7. D. Lawrencium
Q8. D. Boron