Activity Constructing a model of an electric drauit.
What you need: 2 batteries 1.5v, electrical tape, socket, 1 flashlight bulb
15 v, two 25 cm. insulated wire with end scrapped, 1/8
size illustration board, scissors
1. On the illustration board, arrange a circuit to light a bulb
2. Screw the bulb into a socket. Connect a copper wire to each of the sockettering
3. Connect a piece of copper wire to the switch. Connect the lone end of the wire to the nerve end of the
battery
4. Connect one end of the copper wire by winding it which is attached to the socket) to the positive end of the
battery. Connect the other end of the socket to the switch. Did the bulb light
5. Fasten the wires, batteries, and bulb into the illustration using the electrical to secure the circuit and connections
6. Close the open parts of the switch. What happened to the bulb? Why?
7. Switch it off. What happened to the bulb?​

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.

the answer is 1 i believe