What is the period number of the element with atomic number 20?

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Question: What is the period number of the element with atomic number 20?

Options:

Correct Answer: 4

Solution:

The element with atomic number 20 is Calcium, which is in period 4.

What is the period number of the element with atomic number 20?

What is the period number of the element with atomic number 20?

Step 1: Identify the atomic number given in the question, which is 20.
Step 2: Look at the periodic table of elements to find the element with atomic number 20.
Step 3: Find that the element with atomic number 20 is Calcium (Ca).
Step 4: Check the position of Calcium in the periodic table to determine its period.
Step 5: Note that Calcium is located in period 4 of the periodic table.

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