Question

1. Go through the modern periodic table and write the names one below the other of the elements of group 1.
2. Write the electronic configuration of the first four elements in this group.
3. Which similarity do you find in their configuration?
4. How many valence electrons are there in each of these elements?

Answer 1

1. Four elements of group 1:

• Hydrogen (H)
• Lithium (Li)
• Sodium (Na)
• Potassium (K)

2.

Elements	Electronic configuration
Hydrogen	1
Lithium	2, 1
Sodium	2, 8, 1
Potassium	2, 8, 8, 1

3. These elements' valence electrons exhibit similarities. These "elements" have one valence electron.

4. Each of these elements has a single valence electron.