Choose one rock from each of the three categories- sedimentary, igneous, or metamorphic and describe in a complete paragraph (60 + words) the color, luster, streak, hardness, and cleavage of the three rocks you chose. You will write three complete paragraphs, one for each of the rocks you chose to describe. You can also include information about how the rocks are used or where they are commonly found to enhance your writing.

500bc indiais the answer.

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

6because i no yea yea