Mendeleev's Observations

Q.

Mention the contribution of Mendeleev's periodic table. What are the drawbacks of Mendeleev's periodic table?

Q.

State Mendeleev’s periodic law. [1 MARK]

Q.

When Mendeleev made the periodic table, the number of elements discovered till then were __.

Q.

Which chemical compounds of elements were used by Mendeleev to gauge their chemical similarities?

(A) Oxides (B) Chlorides (C) Hydrides (D) Sulphites

1. A, C

2. A, B, C

3. B, D

4. A, B, C, D

Q.

Two elements X and Y need to be arranged in Mendeleev's periodic table. X has 3 protons more ​​​​​than Y but their neutrons are equal in number. Which of the following is correct about X and Y?

1. Y will be placed after X

2. X will be placed after Y

3. X and Y are isotopes

4. Atomic mass of X is less than Y.

Q. According to Mendeleev's periodic law, the properties of elements are a periodic function of their:

1. Atomic masses
   
2. Atomic size
   
3. Atomic volume
4. Atomic number

Q.

how were the elements arranged in the periodic table by mendeleev?

Q.

Compare and contrast the arrangement of elements in Mendeleev's periodic Table and the Modern Periodic Table. [5 MARKS]