Chemistry

Periodic Classification and Elements

1,176 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

Consider the following statements and choose which among them are the characteristics of an atom: I. The atoms of an element are all alike but different from those of others. II. The atoms of an element show all the properties of the element. III. One kind of atom can be changed into another.

  1. I and II

  2. I and III

  3. II and III

  4. I, II and III
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

One kind of atom cannot be changed into another. And an atom can neither be created nor be destroyed by a chemical means.

Multiple choice

Which among the following correctly defines the term atomicity?

  1. Number of atoms present in a molecule of an element.

  2. Number of protons present in an atom of molecule.

  3. Number of atoms present in a compound.

  4. Number of electrons present in an atom of an element.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The number of atoms present in a molecule of an element is called atomicity.

Multiple choice

Match the following elements with their valencies and choose the correct options given below

1.Bromine i. Tetravalent
2. Sulphur ii. Trivalent
3.Nitrogen iii. Monovalent
4. Carbon iv. Divalent

  1. 1-(i), 2-(ii), 3- (iii), 4- (iv)

  2. 1-(ii), 2- (i), 3- (iv), 4-(iii)

  3. 1- (iii), 2-(iv), 3-(ii), 4-(i)

  4. 1-(iv), 2-(iii), 3-(ii),4-(i)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
I. Bromine i. Monovalent
II. Sulphur ii. Divalent
III. Nitrogen iii. Trivalent
IV. Carbon iv. Tetravalent