Ace your NEET prep with MCQs on the classification of elements and periodic trends, each with answers and explanations. Start now!
1. Which element has the electronic configuration [Ar] 4s2 3d10 4p2?
Answer:
Explanation:
The given electronic configuration matches with that of Germanium.
2. Elements in the modern periodic table are arranged based on:
Answer:
Explanation:
In the modern periodic table, elements are arranged in order of increasing atomic numbers.
3. Which block of the periodic table contains the alkali metals?
Answer:
Explanation:
Alkali metals belong to Group 1 and are part of the s-block of the periodic table.
4. Which of the following elements has the highest electronegativity?
Answer:
Explanation:
Fluorine has the highest electronegativity among all elements.
5. The element with the atomic number 36 belongs to which period of the periodic table?
Answer:
Explanation:
Element with atomic number 36 is Krypton, which belongs to the 4th Period.
6. Transition elements are found in which block of the periodic table?
Answer:
Explanation:
Transition elements are found in the d-block of the periodic table.
7. Which of the following is a noble gas?
Answer:
Explanation:
Neon is a noble gas and belongs to the 18th Group of the periodic table.
8. In which group do the halogens belong?
Answer:
Explanation:
Halogens belong to Group 17 of the periodic table.
9. Atomic size generally ________ across a period from left to right.
Answer:
Explanation:
Due to increasing nuclear charge, atomic size decreases from left to right across a period.
10. The second ionization energy is always ________ than the first ionization energy.
Answer:
Explanation:
It requires more energy to remove the second electron after the first one has been removed.
11. Which of the following elements is a metalloid?
Answer:
Explanation:
Boron shows properties of both metals and non-metals and is considered a metalloid.
12. The element which is the most metallic among the following is:
Answer:
Explanation:
Sodium is an alkali metal and shows the most metallic character among the given options.
13. Which element has the lowest atomic radius?
Answer:
Explanation:
Among the given options, Helium has the smallest atomic size.
14. Which of the following is NOT a property of metals?
Answer:
Explanation:
Brittleness is generally a characteristic of non-metals. Metals are typically malleable, ductile, and good conductors of electricity.
15. Which of the following elements is a transition metal?
Answer:
Explanation:
Iron is a d-block element and is considered a transition metal.
16. The ionization energy of elements generally:
Answer:
Explanation:
Ionization energy decreases as we move down a group due to an increase in atomic size and increases from left to right across a period due to an increase in nuclear charge.
17. Which of the following has the highest metallic character?
Answer:
Explanation:
As we move down the group, metallic character increases. Hence, Strontium (Sr) has the highest metallic character among the given options.
18. The element with the highest electron affinity is:
Answer:
Explanation:
Chlorine has the highest negative electron affinity among the halogens.
19. Which of the following elements is known as a coinage metal?
Answer:
Explanation:
Copper, along with silver and gold, is traditionally considered as coinage metals.
20. An element with an electronic configuration of [Ne] 3s2 3p3 belongs to:
Answer:
Explanation:
The given electronic configuration matches with that of phosphorus which belongs to Group 15.