Chemistry · Science General

Periodic Table and Elements

421 Questions

The periodic table and elements questions test knowledge of chemical properties, atomic structures, and periodic trends. Topics include alkali metals, transition elements, and ionisation potential. These concepts frequently appear in general science sections of competitive examinations.

Alkali metals propertiesTransition elementsLattice energyIonisation potentialAlkaline earth metals

Periodic Table and Elements Questions

Multiple choice

Which element has the LOWEST atomic radius?

  1. Rb

  2. K

  3. Na
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Atomic radius increases as you move down a group. Sodium (Na) is in the third period, while Potassium (K) and Rubidium (Rb) are in the fourth and fifth periods respectively, making Na the smallest of the three.

Multiple choice

Which element has the highest Atomic Radius?

  1. Ra

  2. Ba

  3. Sr
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Atomic radius increases as you move down a group. Radium (Ra) is in the seventh period, while Barium (Ba) and Strontium (Sr) are in the sixth and fifth periods, respectively.

Multiple choice

Which element has the highest ionization energy?

  1. C

  2. N

  3. O
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nitrogen (N) has an unusually high first ionization energy due to its stable, half-filled 2p subshell configuration (2p3), which confers extra stability and makes it harder to remove an electron compared to oxygen.

Multiple choice

Which element has the highest ionization energy?

  1. Li

  2. Be
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ionization energy increases as you move across a period. Beryllium (Be) has a higher ionization energy than Lithium (Li) because it has a full 2s subshell, which is more stable.

Multiple choice

Which element has the highest electronegativity?

  1. Br

  2. Cl

  3. I
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electronegativity increases as you move up a group. Chlorine (Cl) is above Bromine (Br) and Iodine (I) in the periodic table, making it the most electronegative of the three.

Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

The compounds of alkaline earth metals ($Mg$) have following magnetic nature:

  1. diamagnetic

  2. anti ferromagnetic

  3. ferromagnetic

  4. paramagnetic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The compounds of alkaline earth metal are diamagnetic because they don't have any unpaired electrons. Their electronic configuration is $np^6ns^2$.

Multiple choice some important compounds of magnesium and calcium the s-block elements chemistry

Which ionisation energy of alkaline earth metal is less than that of alkali metals?

  1. Third

  2. Second

  3. First

  4. Fourth
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The second ionisation energy of alkaline earth metal is less than that of alkali earth metals.
The 2nd electron in case of alkali metal is to be removed from a cation (unipostive ion) which has already acquired a noble gas configuration whereas, in case of alkaline earth metals, the second electron is to be removed from a cation which is yet to acquire the stable noble gas configuration. Therefore, removal of 2nd electron in case of alkaline earth metals requires much less energy than that in the case of alkali metals.

Hence, the correct option is $B$
Multiple choice chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

Tungsten filament is:

  1. non-polar covalent substance

  2. polar covalent substance

  3. ionic substance

  4. metallic substance

  5. noble gas
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tungsten filament represents metallic substance.
Tungsten is a metal. Other examples of metals include iron, copper, aluminium, magnesium, sodium, lead, zinc etc.

Multiple choice polarisation of light polarisation wave optics optics physics

Which inert gas possesses the highest polarizability ? 

  1. He

  2. Ne

  3. Ar

  4. Xe
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Polarizability increases down a group in the periodic table as the atomic radius increases and the outer electrons are further from the nucleus, making them easier to displace. Xenon (Xe) is the largest noble gas listed.