Atomic Structure. Simple electronic configurations (H-Ca).

Is an electrically neutral group of two or more atoms held together by covalent chemical bonds

This lesson will define and explain elements by looking at experiments. The given information will assist in looking at different elements, like solid, liquid and gas. This lesson will show examples to give a step by step explanation of spring analogy and better explain the concept.

This Chemistry lesson is titled Converting between Moles Atoms and Molecules Part 2 and will give a detailed explanation of the topic.

This chemistry lesson is titled What Happens when Stuff Dissolves and will give a detailed explanation of the topic.

We'll learn how to determine the oxidation numbers or oxidation states for a the elements in a chemical compound. The oxidation numbers tell us how electrons are divided up or shared between atoms in a chemical compound. The oxidation numbers also tell us how electrons move in an oxidation reduction (redox) reaction. There are a set a rules that we use to determine oxidation number. Group 1A elements (alkalai metals) always have an oxidation of +1. Group 2A elements (alkaline earth metals) always have an oxidation number of +2. Elements on their own have an oxidation number of 0, and monatomic ions have an oxidation number that is equal to the ionic charge.