Tag: development of the modern 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

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

  1. atomic number.

  2. atomic weight.

  3. number of electrons.

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

In 1869, Dmitri Mendeleev and Lothar Meyer individually came up with their own periodic law "when the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically." 


Hence, the correct option is $\text{B}$

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

Two elements were elected by Mendeleev for studying the properties of compounds formed by other elements with the selected elements. What were the selected elements?

  1. Oxygen, Nitrogen

  2. Hydrogen, Carbon

  3. Hydrogen, Oxygen

  4. Oxygen, Carbon
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The elements selected by Mendeleev were oxygen and hydrogen because most of the elements reacted with oxygen and hydrogen.

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-silicon was the name given by Mendeleev to the element similar to ________ in properties.

  1. Boron

  2. Germanium

  3. Aluminium

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

The name given to the element, by Mendeleev, similar to Germanium in properties was Eka-Silicon.

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 element was not known when Mendeleev gave his classification?

  1. Germanium

  2. Gallium

  3. Scandium

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

The elements which were unknown when Mendeleev gave his classification were geranium, gallium and scandium. He left gaps for the unknown elements and predicted correctly the properties of some of the unknown elements.