What is an atom according to Modern understanding? Select the most accurate response. O A solid, divisible particle that is the building block of matter.
O A solid, indivisible particle that is the building block of matter.
O The smallest particle of matter that retains the properties of that element.
O The smallest particle of matter that retains the properties of that element and is solid and indivisible

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