Anaphylaxis is a potentially life threatening allergic reaction that can start fast and affect your whole body. Seek medical help as soon as symptoms begin. Early signs can include a “feeling of ...

Chlorine is more reactive than the iodine in potassium iodide solution: When a Group 7 element reacts, it gains one electron to form a negative ion with a stable electronic configuration – a full ...

Anaphylaxis is a severe allergic reaction that can quickly become life threatening. It can affect breathing, digestion, and circulation within seconds of exposure. Symptoms can include wheezing, chest ...

Dot and cross diagrams help us to model when ions are formed from atoms. Here’s an example using sodium and chlorine. They form ions which bond to form sodium chloride. 2. Work out how many electrons ...