Question

8.complete the following table
symbol atomic number number of protons number of neutrons number of electrons mass
9
15
si
6
39.948

Explanation:

Step1: Recall atomic number = protons = electrons

For atomic number 9 (Fluorine - F), protons = 9, electrons = 9. Assume common isotope with neutrons = 10, mass = 19.
For protons = 15 (Phosphorus - P), atomic number = 15, assume common isotope with neutrons = 16, electrons = 15, mass = 31.
For Si, atomic number = 14, protons = 14, assume common isotope with neutrons = 14, electrons = 14, mass = 28.
For electrons = 6 (Carbon - C), atomic number = 6, protons = 6, assume common isotope with neutrons = 6, mass = 12.
For mass = 39.948 (Argon - Ar), atomic number = 18, protons = 18, electrons = 18, neutrons = 22.

Answer:

Symbol	Atomic Number	Protons	Neutrons	Electrons	Mass
P	15	15	16	15	31
Si	14	14	14	14	28
C	6	6	6	6	12
Ar	18	18	22	18	39.948