Chlorine in the Periodic Table is surrounded by the elements with atomic numbers 9, 16, 18 and 35.
(a) Which of these have Physical and Chemical properties resembling chlorine.
(b) Which is more electronegative than chlorine?
Anyone please answer it quickly.
Thanks in advance.
Answers
(a) Which of these have Physical and Chemical properties resembling chlorine.
Answer - Elements with atomic number 9 and 35 will have similar physical and chemical properties of chlorine.
(b) Which is more electronegative than chlorine?
Answer - Fluorine is more electronegative than chlorine.
Answer a.
- 9 and 35
Reason
What is the electronic configuration of Chlorine?
- 2,8,7
What is the electronic configuration of atomic number 9?
- 2,7
What is the electronic configuration of atomic number 35?
- 2,8,18,7
What is the electronic configuration of atomic number 16?
- 2,8,6
What is the electronic configuration of atomic number 18?
- 2,8,8
We know that the elements of the same group have same valence electrons, hence same Physical and chemical properties so, atomic number 9 and 35 is the correct answer.
Answer b.
We know that the electronegativity (or non-metallic nature) decreases as we move down the group so the element in the first period of 17th group( no. of valence electrons+10 =group number) will be more electronegative than chlorine.
Therefore, Atomic number 9 is the correct answer
Always Remember:-
- group number = 10+ number of valence electrons (Excluding group 1 and 2)
- period = no. of shells
- electronegativity decreases as we move down the group
- electropositivity increases as we move down the group
- Same group elements will have same valency and valence electrons
- Valency of Same period elements increases numerically and then starts decreasing
- Metallic nature decreases as me move across the period fro. left to right while non-metallic nature increases from right to left