Question

1: Give an example of a period of elements using atomic numbers.

2: Give an example of a group using a group number.

20 points!!

Answer 1

1. The period of element with atomic number 20 in the periodic table is:4
2. Examples. All the Group 1 elements – lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs) and francium (Fr)

Answer 2

1. Example of a period using atomic numbers:

- Period 3: Elements with atomic numbers 11 (Sodium) to 18 (Argon) belong to the third period.

2. Example of a group using a group number:

- Group 17: This is also known as the Halogen group, and it includes elements like Fluorine (atomic number 9), Chlorine (atomic number 17), and so on.