Question

4. Element X has a nucleon (mass) number of 19 and a proton (atomic) number of 9. To which group in the Periodic Table does it belong? A 1 B III C VII D 0​

Answer 1

Answer:

It belongs to VII group.

Answer 2

(C) Element X having a nucleon (mass) number of 19 and a proton (atomic) number of 9 belongs to group VIIA in the periodic table.

Explanation:

• Fluorine, chlorine, bromine, iodine and astatine belongs to group VIIA and it is called halogens.
• Seven valence electrons are present in the orbital levels.
• Fluorine has atomic number 9 and mass number 19 and it is a pale yellow gas.
• The symbol for fluorine is F and it is highly reactive toxic element.
• Fluorine is used in toothpaste.
• Nine electrons are present in the fluorine atoms.