Mendeleev's Observations

Q.

Who was the scientist credited with devising the first periodic table similar to one we use today?

1. John Dalton

2. Gregoe Mendel

3. Dmitri Mendeleev

4. Ernest Rutherford

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 and Y are isotopes.

3. X will be placed after Y

4. X and Y should be placed together.

Q.

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

1. Atomic masses
   

2. Atomic number

3. Atomic volume

4. Atomic size
   

Q.

According to Mendeleev’s Periodic Law, the properties of elements are the periodic function of their ___.

1. atomic density

2. atomic volume

3. atomic numbers

4. atomic masses