Advertisements
Advertisements
Question
How did the early chemists classify elements?
Advertisements
Solution
Early chemists classified the elements on the bases of their properties, nature, character, valency, and whether they were metals or non-metals.
APPEARS IN
RELATED QUESTIONS
Why do we classify elements?
An element Y is in second period and group 16 of the periodic table:
(i) Is it a metal or non-metal?
(ii) What is the number of valence electrons in its atom?
(iii) What is its valency?
(iv) What is the name of the element?
(v) What will be the formula of the compound formed by Y with sodium?
What was the basis of the earliest attempts made for classification and grouping of elements?
Give a reason why elements need to be properly classified.
What is the atomic number of elements of period 3 and group 17 of the Periodic Table?
The atom of an element has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar?
Element ‘A’ has electronic configuration 2, 7; ‘B’ has electronic configuration 2, 8, 5 and ‘C’ has electronic configuration 2, 8, 7. Which two elements will exhibit similar chemical properties?
Which of the following elements does not lose an electron easily?
An element X of group 15 exists as diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell.
- Identify the element X. How many valence electrons does it have?
- Draw the electron dot structure of the diatomic molecule of X. What type of bond is formed in it?
- Draw the electron dot structure for ammonia and what type of bond is formed in it?
Relate the names of the following scientists with the statements given below.
Arranged elements in the increasing order of atomic mass.
