How to find out the electrons in an atom like in pcl5,sf4,NO

To find out the number of electrons in a molecule, you need to know the number of electrons in each atom that makes up the molecule. Here's how you can do it:

1. Identify the atoms in the molecule: For PCl5, the atoms are Phosphorus (P) and Chlorine (Cl). For SF4, the atoms are Sulfur (S) and Fluorine (F). For NO, the atoms are Nitrogen (N) and Oxygen (O).

2. Look up the atomic number of each atom: The atomic number is equal to the number of protons in an atom, and in a neutral atom, the number of protons is equal to the number of electrons. The atomic numbers for the atoms in question are: Phosphorus (15), Chlorine (17), Sulfur (16), Fluorine (9), Nitrogen (7), and Oxygen (8).

3. Multiply the atomic number by the number of atoms: For PCl5, you have one Phosphorus atom and five Chlorine atoms. So, you would have 15 electrons from the Phosphorus atom and 85 electrons from the Chlorine atoms (175), giving a total of 100 electrons. For SF4, you have one Sulfur atom and four Fluorine atoms. So, you would have 16 electrons from the Sulfur atom and 36 electrons from the Fluorine atoms (94), giving a total of 52 electrons. For NO, you have one Nitrogen atom and one Oxygen atom. So, you would have 7 electrons from the Nitrogen atom and 8 electrons from the Oxygen atom, giving a total of 15 electrons.

Remember, this method only works for neutral molecules. If the molecule has a charge, you would need to add or subtract electrons based on the charge.