Merits of Mendeleev's Periodic Table

Q. In Mendeleev’s periodic table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later?

1. 
   
   Chlorine
   
2. 
   
   Silicon
   
3. 
   
   Oxygen
   
4. Germanium

Q. Mendeleev created the 'zero group' only to fit the noble gases which were discovered towards the end of 19th century.

1. True
2. False

Q. Gallium and germanium (discovered later) were placed below aluminium and silicon in their respective groups. The names given by Mendeleev for Gallium and Germanium are Eka-aluminium and Eka-silicon. Similarly, the gap that he has left for the undiscovered element that comes after aluminium is given the name Eka-aluminium.

1. True
2. False

Q.

____________ is an element for which Mendeleev had left a blank space in his periodic table, assuming it would be discovered in the future.

Q.

In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later

1. Germanium

2. Chlorine

3. Oxygen

4. Silicon

Q. The properties of eka-boron predicted by Mendeleev have similar properties to the element _______, which was discovered later.

1. 
   
   Gallium
   
2. 
   Aluminium
3. 
   
   Scandium
   
4. 
   
   Germanium
   

Q. The element "Eka-aluminium" predicted by Mendeleev was later discovered as

1. Gallium
2. Helium
3. Scandium
4. Calcium

Q. Which group elements of modern periodic table were placed along with alkali metals in Mendeleev table?

1. $IB$
2. $IIB$
3. $IA$
4. $IIA$

Q. Write short notes on:
a. Mendeleev’s periodic law.
c. Position of isotopes in the Mendeleev’s and the modern periodic table.

Q. Hydrogen is placed above the alkali metals in both Modern periodic table and Mendeleevs periodic table, but why it is considered as a demerit only in Mendeleevs periodic table and not in Modern periodic table?

Q. Gallium and germanium (discovered later) are placed below aluminium and silicon in their respective groups. The names of Gallium and Germanium as given by Mendeleev are Eka-aluminium and Eka-silicon.

1. True
2. False

Q. In Mendeleev’s Periodic Table the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.

Q.

Mendeleev predicted the existence of some undiscovered elements based on his periodic table.

1. True

2. False

Q. What were the names used to denote the existance of undiscovered elements such as gallium and germanium respectively?

1. Eka-aluminium and Eka-silicon
2. Eka-boron and Eka-aluminium
3. Eka-silicon and Eka-aluminium
4. Eka-aluminium and Eka-boron

Q.

What is the basic difference between Mendeleevs periodic table and modern periodic table?

Q. The properties of _________ were predicted by Mendeleev before their isolation.

1. Co and Ni
2. I and Te
3. Sc, Ga and Ge
4. Cl, Ar and K

Q. In Mendeleev's Periodic Table, why was there no mention of Noble gases like Helium, Neon and Argon?

Q. (a) How do the properties of eka-aluminium element predicted by Mendeleev compare with the actual properties of gallium element?
(b) What names were given by Mendeleevto the then undiscovered elements (i) scandium (ii) gallium, and (iii) germanium?

Q. Mendeleev's eka-aluminium is _________.

1. scandium
2. germanium
3. gallium
4. indium

Q. What physical and chemical properties of elements did Mendeleev consider in compiling the periodic table? What challenges did Mendeleev face in following periodic law?

Q.

Which element replaced eka-aluminium in the modern periodic table?

1. Gallium

2. Germanium

3. Silicon

4. Arsenic

Q. Mendeleev predicted the existence of some undiscovered elements based on his periodic table.

1. False
2. True

Q. In Mendeleev's Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later?

1. Oxygen
2. Chlorine
3. Silicon Ana
4. Germanium

Q. What were the names used to denote the existance of undiscovered elements such as gallium and germanium respectively?

1. Eka-aluminium and Eka-silicon
2. Eka-boron and Eka-aluminium
3. Eka-aluminium and Eka-boron
4. Eka-silicon and Eka-aluminium

Q. The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminimum and eka-silicon. What names were given to these elements when they were discovered later on?