Chemistry

Periodic Classification and Elements

1,092 Questions

Periodic classification organizes chemical elements based on atomic structure, periodic laws, and elemental properties. It covers historical classification systems, electron configurations, and periodic trends. Test takers preparing for chemistry sections will find these questions crucial for mastering fundamental element properties and atomic interactions.

Periodic table structureAtomic orbitalsElement identificationPeriodic laws

Periodic Classification and Elements Questions

Multiple choice

Which of the following is not included in 's' block?

  1. Cs

  2. Mg

  3. Ca

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

Helium (He) is a noble gas with electron configuration 1s², placing it in the p-block of the periodic table (Group 18). While it fills the 1s orbital, helium is classified with other noble gases due to its similar chemical properties. Cs, Mg, and Ca are all s-block elements - Cs is in Group 1 (alkali metals) while Mg and Ca are in Group 2 (alkaline earth metals).

Multiple choice

Which is the Symbol of Magnesium element?

  1. Ma

  2. Mg

  3. Mn

  4. None of these.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mg is the correct chemical symbol for Magnesium. Chemical symbols are standardized internationally - Mg comes from the Latin 'Magnesium'. Option A (Ma) is incorrect, Mn is Manganese, and the 'None of these' option is unnecessary since the correct answer is present.

Multiple choice

Noble gases or Inert gases have been kept in

  1. Group V of periodic table

  2. Group VI of periodic table

  3. Group VII of periodic table

  4. Group VIII of periodic table
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Noble gases (helium, neon, argon, krypton, xenon, radon) are placed in Group 18 of the modern periodic table, which was historically designated as Group VIII. These elements have complete valence electron shells, making them extremely unreactive.

Multiple choice

The symbol of aluminum element is

  1. Al

  2. Au

  3. A

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The chemical symbol for aluminum is 'Al', derived from its Latin name 'alumen'. Gold is 'Au', and single-letter symbols are not used for aluminum in the periodic table.

Multiple choice

The symbol of Hydrogen element is

  1. Hy

  2. H

  3. Hn

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The chemical symbol for hydrogen is 'H', derived from its Latin name 'Hydrogenium'. 'Hy' would be incorrect as chemical symbols use either one or two letters (first letter capitalized, second lowercase). 'Hn' is not a standard chemical symbol for any element.

Multiple choice

Which of the following sets does not exist for 4p electron?

  1. n = 4, l = 1, m = - 1, ms = + 1/2

  2. n = 4, l = 1, m = - 3, ms = + 1/2

  3. n = 4, l = 1, m = - 2, ms = + 1/2

  4. n = 4, l = 1, m = - 2, ms = - 1/2

  5. n = 4, l = 1, m = 0, ms = - 1/2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For 4p electron, the four quantum numbers are given as: n = 4, l = 1, m = -1, 0, +1, ms = +1/2 or -1/2