Question

1. draw a bohr model for sodium (na). atomic number = 11, atomic mass = 23. (show protons, neutrons, and electron arrangement in shells.)

Explanation:

Step1: Determine number of protons

Atomic number = number of protons. So, number of protons in sodium = 11.

Step2: Calculate number of neutrons

Atomic mass = protons + neutrons. Neutrons = Atomic mass - protons. So, neutrons = 23 - 11 = 12.

Step3: Determine electron arrangement

The first shell can hold 2 electrons, the second shell can hold 8 electrons. For sodium with 11 electrons, the first shell has 2 electrons, the second shell has 8 electrons and the third shell has 1 electron.

Answer:

To draw the Bohr - model:

1. Draw a small circle in the center to represent the nucleus. Write "11p" (for 11 protons) and "12n" (for 12 neutrons) inside the nucleus.
2. Draw three concentric circles around the nucleus to represent the electron - shells.
3. Place 2 electrons on the innermost shell, 8 electrons on the second shell, and 1 electron on the outermost shell.