Tag: mendeleev's periodic table

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Multiple choice chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chlorine, oxygen and silicon were included in Mendeleev's periodic table. Germanium was discovered later which fit into the empty spaces left by Mendeleev and matched to the expected properties. 

Multiple choice chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

The elements which have taken the place of Eka aluminium is :

  1. Germanium

  2. Gallium

  3. Silicon

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

Eka-silicon means germanium. It occurred because of silicon whereas eka-aluminium occurred because of aluminium and later named it as gallium. 


While filling the elements considering atomic number would be main and fundamental property there were gaps in the mentioned groups hence he filled them with these names.

Hence the correct option is B.

Multiple choice chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

Which group of elements could be placed in Mendeleev's Periodic Table without disturbing the original order?

  1. Alkali metals

  2. Alkaline earth metals

  3. Non - metals

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

According to Mendeleevs classification, the properties of elements are the periodic function of their atomic masses and there is a periodic recurrence of elements with similar physical and chemical properties. Noble gas being inert, could be placed in a separate group without disturbing the original order.

Multiple choice chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

Mendeleev classified elements in:

  1. increasing order of atomic groups.

  2. seven periods and eight groups.

  3. seven periods and nine groups

  4. eight periods and seven groups.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mendeleev kept elements in increasing order of atomic weights in seven periods and eight groups.
Therefore, option $B$ is correct. 

Multiple choice chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

The elements whose atomic weight was corrected by Mendeleev are _______

  1. Uranium.

  2. Indium

  3. Beryllium

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mendeleev described the elements according to both atomic weight and valency. 


The elements if arranged according to their atomic weights exhibit periodicity of properties.

He corrected the atomic weights of thorium, indium, beryllium, and uranium.

Option D is correct.

Multiple choice chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

Most transition metals from multiple cations, that is, they have more than one possible amount of positive charge. Virtually all of the transition metals form dipositive $(2+)$ cations, along with one or more other forms. For example, titanium forms $Ti^{2+}$ ad $Ti^{4+}$, and cobalt forms $Co^{2+}$ and $Co^{3+}$.
The principal exceptions to this predominance of cations with a $2^{+}$ charge are scandium and yttrium, which form only tripositive cations. $Sc^{3+}$ and $Y^{3+}$, and copper and silver, which form cations with a single positive charge. $Cu^{+}$ and $Ag^{+}$.
[While copper also forms dipositive $Cu^{2+}$, silver exhibits the single positive state essentially exclusively.]
Which of the following offers a POSSIBLE explanation for the existence of $Cu^{+}$ and $Ag^{+}$?

  1. Mendeleev placed copper and silver in Group IB on his original periodic table because they formed compounds with the same combining ratios as elements in Group $1A$.

  2. Elemental copper and silver have a single valence electron, which is lost in cation formation.

  3. Copper and silver have higher ionization energies than the other transition metals in their respective periods, so are unable to lose more than one electron.

  4. The loss of one electron gives copper and silver noble gas configurations.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Configuration of Cu and Ag is $\left[ Ar \right] 3{ d }^{ 10 }4{ s }^{ 1 }$ and $\left[ Kr \right] 4{ d }^{ 10 }5{ s }^{ 1 }$ respectively. Thus both have $1$ valence electron which is lost in cation formation. Thus correct answer is option B.

Multiple choice chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

How many elements were known when Mendeleev presented the periodic table?

  1. 63

  2. 80

  3. 93

  4. 102
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
63 elements were known during the time of the introduction of the Mendeleev periodic table.

During Mendeleev's work, only 63 elements were known.

Option A is correct.
Multiple choice chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

Mark the group which has maximum number of element in Mendeleev's periodic table:

  1. $I$
  2. $II$
  3. $III$
  4. $IV$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In Mendeleev's original periodic table, Group I contained the alkali metals and was quite extensive, often holding more elements than other groups in the early versions.

Multiple choice chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

Eka-aluminum and Eka-silicon are known as:

  1. gallium and germanium

  2. aluminium and silicon

  3. iron and sulphur

  4. sodium and silicon
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer A

According to Mendeleev he named eka aluminium presently known as Gallium
and eka silicon presently known as Germanium.

Multiple choice chemistry the periodic table mendeleef's periodic table mendeleev's periodic law and its limitations mendeleev's periodic table development of the modern periodic table into the history

The Mendeleev's periodic table consists of groups: 

  1. seven

  2. eight

  3. nine

  4. ten
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Eight groups were there in the Mendeleev's periodic table.

Mendeleev divided his periodic table in eight groups and seven periods.

Option B is correct.