Answer: 3d
Explantion:
1) Period 4 contains the elements with atomic numbers 19 through 36.
2) The elements with atomic numbers 19 (K) and 20 (Ca) fill the orbital 4s.
3) After that, as Aufbau's rule may help you to remember, the energy of the orbitals 3d is lower than the energy of the orbtitals 4p. So, the element 21 (Sc) start fillind the orbital 3d.
There are ten 3d orbitals, so the elements 21 through 30 fill the 3d orbitals.
Those elements, called transition metals are: Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn.
When the 3d orbitals are full, the next elements in the same period 4, fill the six 4p orbitals.
The third compound will have a suffix of -yne. Alkynes are molecules that contain triple bonds.
Answer:
- An ion is a charged particle.
- Ion may consist of a single charged atom or a group of atoms that have a net charge on them.
- A negatively charged ion is called anion.
- A positively charged ion is called cation.
<h3>For Example,</h3>
Sodium: Na⁺, Chloride: Cl⁻, Ammonium: NH₄⁺ Carbonate: CO₃²⁻
<u>-TheUnknownScientist</u><u> 72</u>
