Considering the elements B, Al, Mg and K, the correct order of their metallic character is:
Correct answer: D. K > Mg > Al > B
- A. B > Al > Mg > K
- B. Al > Mg > B > K
- C. Mg > Al > K > B
- D. K > Mg > Al > B
Explanation
The metallic character of elements generally increases as you move down a group in the periodic table because the atoms have more electron shells, making it easier to lose electrons. Conversely, metallic character decreases across a period from left to right due to increased nuclear charge, which holds the electrons more tightly. Among the elements given: potassium (K) is an alkali metal and is the most metallic, followed by magnesium (Mg) and aluminum (Al), which are both metals but less metallic than K. Boron (B) is a metalloid with the least metallic character in this group. Therefore, the correct order of increasing metallic character is K > Mg > Al > B.
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: