Question

(a) In the modern periodic table, which are the metals among the first ten elements?
(b) What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.

Answer 1

Answer:

Explanation:

1

lithium

beryllium

2

atomic number is unique hence we can distinguish elements

ex.

h==1

he==2

h and he are not the same and

he comes after h

Answer 2

Lithium, Boron and Beryllium have Metallic Properties

Explanation:

a.) In the First Ten Elements are have got only Lithium,Boron and Beryllium as elements to show the metallic properties.

b.) In the Modern periodic Table the elements are arranged as per their relative atomic numbers as it is done in increasing order of atomic number and further it helps in differentiating with the chemical as well as physical properties.