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
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Answer:
It belongs to VII group.
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(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.
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