Halogens are classified together as a group because all elements - Are conductors of electricity, , ,

Have the same atomic mass

Have similar chemical & physical properties

Are malleable and ductile

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under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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