Question

what is periodic table and what is mendelvee's periodic table​

Answer 1

Answer:

periodic table means number of element placed in increasing atomic number

Mendeleev's periodic table means all elements placed on the basis of atomic masses or weight

Answer 2

Answer:

When elements are arranged in the order of increasing atomic masses, the element with similar properties occur at regular intervals.

→ The properties of elements are a periodic function of their atomic masses.

→ Mendeleev’s periodic table is based on the chemical properties of elements. It contains 7 periods (horizontal rows) and 8 groups (vertical columns).

• Merits of Mendeleev’s Periodic Table

→ Some gaps were left for the undiscovered elements like gallium (Ga), Scandium (Sc) and Germanium (Ge).

→ Predict properties of elements on the basis of their positions in the periodic table.

→ Accommodate noble gases when they were discovered without disturbing the original arrangement.

• Limitations of Mendeleev’s Classification

→ Position of isotopes could not be explained.

→ No fixed position for hydrogen.

→ Wrong order of atomic masses of some elements could not be explained.

Explanation:

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