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As you go down group 2, atom size increases. Larger atoms experience more shielding. There is an increase in nuclear charge going down group 2 elements so you would expect the outer electrons to be held m...

The alveoli are like small sacks present at the base of the lung, and are the site of exchange between the air we breathe and our blood. This exchange occurs by the process of diffusion, for which alveoli...

Sources can seem daunting and difficult to understand, but an organised approach can allow you to analyse the source effectively and easily. Firstly, it is important to understand exactly what the questio...

There are two possible solutions, substitution and using absolute value. Here, we will use absolute value method.By definition of square root we get: sqrt(x^2) = |x|. By definition of absolute value we ge...

HIV is a retrovirus that infects specifically T helper cells / CD4 cells in the body.the glycoprotein (envelope protein) on the surface of the virus is able to bind to receptors on CD4 cells, and causes t...