Q4 of 27 Page 62

There are three shells in the atom of element ‘X’, 6 electrons are present in its outmost shell.
What is its atomic number?

Atomic number = 16

The electronic configuration of the element X is

2,8,6. Add all the electrons.

2+8+6 = 16

Thus, the element has atomic number 16

Symbols of certain elements are given. Write their electronic configuration and find the period and group in which they are included.

(a) 12/6C (b) 24/12Mg (c) 35/17Cl (d) 27/13Al (e) 20/10Ne

There are three shells in the atom of element ‘X’, 6 electrons are present in its outmost shell.

Write the electronic configuration of the element.

There are three shells in the atom of element ‘X’, 6 electrons are present in its outmost shell.

In which period does this element belong?

There are three shells in the atom of element ‘X’, 6 electrons are present in its outmost shell.

In which group is this element included?

Questions · 27

3. Classification of elements and the periodic table

1 2 3 4 4 4 4 4 4 4 5 5 5 5 6 6 6 6 6 6 6 6 1 2 3 4 5

There are three shells in the atom of element ‘X’, 6 electrons are present in its outmost shell.What is its atomic number?