Question

ii. bohr model practice d. fill in the chart for the bohr model and electron information required. element atomic # bohr model # of valence electrons mg p li cl be stop and bring your work to mrs. muller to check for accuracy and earn your next spot pick!

Explanation:

Step1: Recall atomic numbers

The atomic number of an element is unique and represents the number of protons and also the number of electrons in a neutral atom. For Mg, atomic number is 12; P is 15; Li is 3; Cl is 17; Be is 4.

Step2: Determine electron - shell distribution

The first shell can hold a maximum of 2 electrons, the second shell can hold a maximum of 8 electrons, and subsequent shells follow the 2n² rule (n is the shell number). We distribute electrons accordingly. For example, for Mg with 12 electrons, we have 2 in the first shell, 8 in the second shell, and 2 in the third shell.

Step3: Identify valence electrons

Valence electrons are the electrons in the outermost shell. For Mg with electron - configuration 2 - 8 - 2, the outermost shell has 2 electrons, so it has 2 valence electrons. Similarly, we find the valence electrons for other elements.

Answer:

Element	Atomic #	Bohr Model (simplified description)	# of valence Electrons
P	15	2 - 8 - 5 (2 electrons in the first shell, 8 in the second, 5 in the third)	5
Li	3	2 - 1 (2 electrons in the first shell, 1 in the second)	1
Cl	17	2 - 8 - 7 (2 electrons in the first shell, 8 in the second, 7 in the third)	7
Be	4	2 - 2 (2 electrons in the first shell, 2 in the second)	2