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

What is a chemical compound?

  1. A subatomic particle

  2. A combination of two protons and two electrons

  3. A combination of two or more chemical elements

  4. A mixture of two or more substances
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

fact

Multiple choice

Which of the following statements is/are false? 

(a) If an element combines with another element by the loss or gain of electrons to form electrovalent compounds, its valency is known as electrovalency.

(b) The number of neutrons in one atom of an element is known as the atomic number of the element. 

(c) Electron arrangement of noble gases is very stable that they do not allow their outermost electrons to take part in chemical reactions.

  1. Only (a)

  2. Only (a) and (b)

  3. Only (b)

  4. Only (b) and (c)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as this statement is false. The number of protons in one atom of an element is known as the atomic number of the element.