Question 1:
State three physical properties of elements down the Group 17.
Answer:
• The melting point and boiling point increases
• The colour becomes darker
• The density increases
State three physical properties of elements down the Group 17.
Answer:
• The melting point and boiling point increases
• The colour becomes darker
• The density increases
Question 2:
Fluorine is very reactive compared to iodine. The reaction of fluorine with almost all other elements is very vigorous. Why is fluorine more reactive compared to iodine?
Answer:
The reactivity of Group 17 elements depends on the ability of the atom to receive an electron easily.
The size of the fluorine atom is smaller than the size of the iodine atom. Hence the nuclear attraction towards electrons in the fluorine atom is stronger compared to iodine. Hence it is easier for fluorine to receive an electron compared to iodine.
Fluorine is very reactive compared to iodine. The reaction of fluorine with almost all other elements is very vigorous. Why is fluorine more reactive compared to iodine?
Answer:
The reactivity of Group 17 elements depends on the ability of the atom to receive an electron easily.
The size of the fluorine atom is smaller than the size of the iodine atom. Hence the nuclear attraction towards electrons in the fluorine atom is stronger compared to iodine. Hence it is easier for fluorine to receive an electron compared to iodine.
Question 3:
Give two examples of substances that contain Group 17 elements.
Answer:
• Disinfectant contains iodine.
• Drinking water contains chlorine.
Give two examples of substances that contain Group 17 elements.
Answer:
• Disinfectant contains iodine.
• Drinking water contains chlorine.
Question 4:
Astatine is not used in the science laboratory. Explain.
Answer:
Astatine is rare radioactive element because it is chemically unstable. Astatine can be produced form the radioactive decay of uranium, neptunium and plutonium. Hence, astatine is not used in the
laboratory.
Astatine is not used in the science laboratory. Explain.
Answer:
Astatine is rare radioactive element because it is chemically unstable. Astatine can be produced form the radioactive decay of uranium, neptunium and plutonium. Hence, astatine is not used in the
laboratory.