Valence Electrons of Elements

The video tutorial explains how to determine the number of valence electrons for elements using the periodic table. It covers the general trends across different groups, highlighting specific examples like hydrogen, sodium, phosphorus, and carbon. The tutorial also addresses exceptions, such as helium, and provides practice exercises to reinforce learning. The method of using the periodic table is emphasized as a quick and effective way to find valence electrons, especially for exams.

What is the number of valence electrons in hydrogen?

• 1

• 2

• 3

• 4

Which element in Group 1 has 11 electrons in total?

• Lithium

• Hydrogen

• Potassium

• Sodium

How many valence electrons does an element in Group 14 typically have?

• 3

• 2

• 4

• 5

Why is helium an exception in Group 18 regarding valence electrons?

• It has 4 valence electrons.

• It has 2 valence electrons.

• It has 8 valence electrons.

• It has 6 valence electrons.

How many valence electrons does phosphorus have?

• 3

• 4

• 6

• 5

What is the number of valence electrons in carbon?

• 5

• 4

• 3

• 2

Magnesium belongs to which group and how many valence electrons does it have?

• Group 4, 4 valence electrons

• Group 3, 3 valence electrons

• Group 2, 2 valence electrons

• Group 1, 1 valence electron

Boron is in Group 13. How many valence electrons does it have?

• 3

• 2

• 1

• 4

How many valence electrons does krypton have?

• 9

• 8

• 7

• 6

Which element in Group 18 has only 2 valence electrons?

• Xenon

• Neon

• Argon

• Helium