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

The principal quantum number is related to the

  1. size of the orbital

  2. orientation of the orbital in space

  3. orbital angular momentum

  4. spin angular momentum

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The principal quantum number 'n' represents the relative overall energy of each orbital and the energy of each orbital increases as the distance from the nucleus increases.

Multiple choice

Atoms of an element differ from atoms of all the other elements in

  1. atomic number and electronic configuration

  2. atomic number and number of valence electrons

  3. number of neutrons and electronic configuration

  4. number of neutrons and number of valence electrons
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Atoms of an element differ from atoms of all the other elements in atomic number and electronic configuration.

Multiple choice

What is the maximum number of electrons present in N-shell?

  1. 8

  2. 18

  3. 64

  4. 32
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The maximum number of electrons that can occupy a specific energy level can be found using the following formula: Electron Capacity = 2n2 Thus, maximum number of electrons in N-shell will be = 2 x 42 = 32

Multiple choice

Atom is the ________part of an element.

  1. biggest

  2. largest

  3. smallest

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Atoms are the smallest particles that retain the chemical properties of an element. They consist of electrons orbiting a nucleus containing protons and neutrons. Atoms combine to form molecules but are themselves the fundamental units of matter.

Multiple choice

_____________ contain unpaired number of electrons.

  1. Diamagnetic materials

  2. Paramagnetic materials

  3. Ferromagnetic materials

  4. Ferrimagnetic materials
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Paramagnetic materials have a small, positive susceptibility to magnetic fields. These materials are slightly attracted by a magnetic field and the material does not retain the magnetic properties when the external field is removed. Paramagnetic properties are due to the presence of some unpaired electrons.

Multiple choice

Which is the symbol of ' Barium element'?

  1. Br

  2. B

  3. Ba

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

Barium is a chemical element with symbol Ba and atomic number 56. 'Br' is Bromine, 'B' is Boron. Barium gets its name from the Greek word 'barys' meaning heavy, as it's a dense alkaline earth metal. The symbol Ba comes from its Latin name 'Baryta'.