Question

1. electron transitions

• based on the three images below label which atom shows the ground state, the excited state, and emission spectrum lines.

1. bohr model practice

directions: using the periodic table determine the number of electrons for each element and fill in the corresponding bohr model.
sodium (na)
aluminum (al)
carbon (c)
silicon (si)
oxygen (o)
chlorine (cl)
fluorine (f)
phosphorus (p)
lithium (li)

Explanation:

Step1: Recall atomic number = electron number

The atomic number of an element gives the number of electrons in a neutral atom.

Step2: Find atomic numbers

• Sodium (Na) has atomic number 11, so 11 electrons.
• Aluminum (Al) has atomic number 13, so 13 electrons.
• Carbon (C) has atomic number 6, so 6 electrons.
• Silicon (Si) has atomic number 14, so 14 electrons.
• Oxygen (O) has atomic number 8, so 8 electrons.
• Chlorine (Cl) has atomic number 17, so 17 electrons.
• Fluorine (F) has atomic number 9, so 9 electrons.
• Phosphorus (P) has atomic number 15, so 15 electrons.
• Lithium (Li) has atomic number 3, so 3 electrons.

Answer:

Sodium (Na): 11
Aluminum (Al): 13
Carbon (C): 6
Silicon (Si): 14
Oxygen (O): 8
Chlorine (Cl): 17
Fluorine (F): 9
Phosphorus (P): 15
Lithium (Li): 3