Electron Configurations and Chemical Bonding

This video tutorial explains the difference between core and valence electrons using electron configurations. It covers how to identify valence electrons as the outermost electrons in the highest energy level and core electrons as those in lower energy levels. The video also compares the electron configurations of calcium and phosphorus to illustrate these concepts.

What is the purpose of electron configurations in chemistry?

• To determine the atomic mass of an element

• To represent the arrangement of electrons around a nucleus

• To calculate the number of protons in an atom

• To identify the isotopes of an element

Which electrons are considered valence electrons in an atom?

• Electrons that are closest to the nucleus

• Electrons in the innermost energy level

• Electrons in the highest energy level s and p orbitals

• Electrons in the d orbitals

Why are valence electrons important in chemical bonding?

• They are the heaviest electrons

• They are the farthest from the nucleus and involved in bonding

• They are the most stable electrons

• They are the only electrons that can be removed

What distinguishes core electrons from valence electrons?

• Core electrons are in the outermost energy level

• Core electrons are always in the s orbitals

• Core electrons are involved in bonding

• Core electrons are in energy levels lower than the valence electrons

How do core electrons affect the properties of an atom?

• They have no effect on the atom's properties

• They shield the nucleus and affect atomic size

• They are involved in chemical bonding

• They determine the atom's reactivity

What is the electron configuration of calcium?

• 1s2 2s2 2p6 3s2 3p6 4p2

• 1s2 2s2 2p6 3s2 3p6 3d2

• 1s2 2s2 2p6 3s2 3p6 4d2

• 1s2 2s2 2p6 3s2 3p6 4s2

How many valence electrons does phosphorus have?

• 3

• 5

• 7

• 8

In the context of electron configurations, what does the term 'highest energy level' refer to?

• The energy level with the most electrons

• The energy level closest to the nucleus

• The outermost energy level with electrons

• The energy level with the least electrons

What is the total number of core electrons in a neutral calcium atom?

• 18

• 16

• 10

• 8

Which of the following statements is true about core electrons?

• They are involved in chemical reactions

• They are always in the p orbitals

• They are found in the highest energy level

• They are not involved in bonding