Ions and Electron Configurations

This video tutorial by Dr. B explains how to determine the number of electrons in elements and ions. It starts with neutral elements, where the atomic number equals the number of electrons. For positive ions, electrons are removed based on the charge, while for negative ions, electrons are added. Examples include sodium, calcium, oxygen, and nitrogen. The video concludes with a summary of these concepts.

What is the atomic number of oxygen, and how many electrons does it have in its neutral state?

• 8, with 8 electrons

• 9, with 9 electrons

• 7, with 7 electrons

• 10, with 10 electrons

How many electrons does a neutral fluorine atom have?

• 10

• 9

• 8

• 7

If a sodium ion has a positive charge, how many electrons does it have?

• 9

• 10

• 11

• 12

Calcium forms a 2+ ion. How many electrons does this ion have?

• 16

• 18

• 20

• 22

What is the charge of ions formed by elements in group 17?

• 1-

• 2-

• 1+

• 2+

How many electrons does an oxide ion have?

• 8

• 9

• 10

• 11

A nitride ion has how many electrons?

• 10

• 9

• 8

• 7

What happens to the number of electrons when an atom forms a positive ion?

• Electrons are added

• Protons are removed

• Electrons are removed

• Protons are added

When an atom forms a negative ion, what change occurs in its electrons?

• Electrons are removed

• Protons are removed

• Electrons are added

• Protons are added

Why do negative ions have more electrons than their neutral atoms?

• Because electrons are removed

• Because protons are removed

• Because protons are added

• Because electrons are added