Question

the rings in the bohr model, represent the energy levels in the atom. try these for yourself. draw the bohr model for the following atoms. state the electron arrangement for each atom. aluminum, a lithium, li helium, he potassium beryllium carbon

Explanation:

Step1: Recall atomic number of elements

Atomic number determines electron - count. Helium (He) has atomic number 2, Beryllium (Be) has atomic number 4, Potassium (K) has atomic number 19.

Step2: Determine electron arrangement rules

The first energy level can hold 2 electrons, the second can hold 8, and the third can hold 8 (initially).

Step3: Find electron arrangement for Helium

Helium has 2 electrons, so the arrangement is 2.

Step4: Find electron arrangement for Beryllium

Beryllium has 4 electrons. 2 in first level and 2 in second level, so the arrangement is 2,2.

Step5: Find electron arrangement for Potassium

Potassium has 19 electrons. 2 in first level, 8 in second level, 8 in third level and 1 in fourth level, so the arrangement is 2,8,8,1.

Answer:

Helium: 2
Beryllium: 2,2
Potassium: 2,8,8,1