Question

Use the periodic table from the lesson to answer the following question.

The atomic mass of Fis
9
O 10
19
O 55

Answer 1

18.99u or 19u

Step-by-step explanation:

Mass number=No of protons+No of neutrons

`\\ \sf\longmapsto 9+10`

`\\ \sf\longmapsto 19u`

• Fluorine has atomic number=9
• The Electronic configuration is given by

`\\ \sf\longmapsto 1s^22s^22p^5`