An unknown element having electronic configuration [Ne] 5s2 5p5 will be.
Correct answer: C. Non-metal of VII-A group
- A. Metal of II-A group
- B. Metalloid of V-A group
- C. Non-metal of VII-A group
- D. Non-metal of V-A group
Explanation
The electronic configuration [Ne] 5s2 5p5 indicates that the unknown element has:- A noble gas core (Ne)- 2 electrons in the 5s orbital- 5 electrons in the 5p orbitalThis configuration corresponds to a halogen, specifically Astatine (At), which is a non-metal in group VII-A (17) of the periodic table.
Last updated
About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
Practise s-Block and p-Block Elements
1,359 free s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
2. Law of octaves was proposed by
7th period of the periodic table contains normal elements:
(A), (B) and (C) are elements in the third period. The oxide of(A) is ionic, that of (B) is amphoteric and that of (C) is a giant molecule (covalent network). (A), (B) and (C) have atomic numbers in the order:
(A), (B) and (C) are elements in the third short period. Oxide of (A) is ionic, that of (B) is amphoteric and of (C) a giant molecule. (A), (B) and (C) have atomic numbers in the order of:
A gas that reacts with CaO and not with NaHCO3 is: