Question

An element has atomic number 19. where would you expect this element in the periodic table and why?2m for 10 class​

Answer 1

Answer:

in group 1( 19 atomic number is for potassium )

Answer 2

First group, Fourth period

Explanation:

Since the element has atomic number of 19, its Electronic Configuration can be written as:

2, 8, 8, 1

This means that there are

• 2 electrons in K shell
• 8 electrons in L shell
• 8 electrons in M shell
• 1 electron in N shell

As we can see, the electrons have occupied 4 shells.

So, the element belongs to Fourth period.

In the outermost shell which is the N shell, only 1 electron is present.

So, the element belongs to First group.