What are the advantages and disadvantages of Mendeleev classification?
When noble gases were discovered can be kept in a separate group without disturbing the existing order. Disadvantages: He couldn’t allocate a correct position to hydrogen. Atomic masses didn’t increase in a regular manner, so it was impossible to predict how many elements could be discovered between two elements.
What were the two major shortcomings of Mendeleev’s periodic table?
1) Hydrogen has properties of both halogens and alkali. Hence, the position of the element hydrogen in the periodic table could not be ascertained. 2) In the in Mendeleev’s periodic table, the isotopes are placed next to their core element because they share similar properties.
What are the disadvantages of the long form periodic table?
Drawbacks of the long form of periodic table:
- The position of hydrogen is not justified. It resembles alkali metals and halogens both but it is placed with alkali metals.
- There is no place for isotopes.
- f-block that is lanthanides and actinides have not been placed in the main body of the periodic table.
What are some of the advantages to the common form of the periodic table?
ADVANTAGES OF THE PERIODIC TABLE:
- It is easier to remember the properties of an element if its position in the periodic table is known.
- The periodic table has made the study of chemistry systematic and easy.
- The type of compounds formed by an element can be predicted by knowing it position in the periodic table.
What are the advantages of periodic changes?
Advantages are: The periodic table has made the study of chemistry systematic and easy. 2 It is easier to rember the properties of an element if its position in the periodic table is known.
What is periodic change give example?
Periodic and non-periodic changes Changes that repeat at regular intervals are called periodic changes. Examples: The occurrence of day and night and the waxing and waning of the moon. Certain changes that do not repeat themselves at regular intervals of time, and such changes are called non-periodic changes.
Do elements change over time?
The periodic table has long-since filled in Mendeleev’s gaps and has added new elements. It has even changed the weights of other elements. The periodic table is continually being changed as new discoveries are made and new theories are developed to explain the behavior of chemicals.
How do elements change?
If you change the number of protons an atom has, you change the type of element it is. If you change the number of neutrons an atom has, you make an isotope of that element. All known elements are arranged on a chart called the Periodic Table of Elements.