Valence Electrons and Calcium Properties

This video tutorial explains how to determine the number of valence electrons in a calcium atom. It presents two methods: using the periodic table and writing the electron configuration. Calcium, found in group two of the periodic table, has two valence electrons. The electron configuration method confirms this by identifying the electrons in the highest energy level, which is the fourth energy level for calcium, containing two valence electrons.

What is the main focus of the video?

• The number of protons in calcium

• The atomic mass of calcium

• The number of valence electrons in calcium

• The chemical reactions of calcium

Which group in the periodic table does calcium belong to?

• Group 4

• Group 1

• Group 3

• Group 2

How many valence electrons does calcium have according to the periodic table?

• Four

• One

• Two

• Three

What is the atomic number of calcium?

• 20

• 19

• 21

• 18

How many total electrons does a neutral calcium atom have?

• 20

• 21

• 19

• 18

In which energy level are the valence electrons of calcium found?

• Third energy level

• Fourth energy level

• Second energy level

• Fifth energy level

What is the conclusion about the number of valence electrons in calcium?

• Calcium has one valence electron

• Calcium has four valence electrons

• Calcium has two valence electrons

• Calcium has three valence electrons