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Chemistry

forming positive ions -

Metal atoms lose electrons from their outer shell when they form ions:

the ions formed are positive, with more protons than electrons

the ions formed have full outer shells

forming a negative ion -

The outer shell of non-metal atoms gains electrons when they form ions:

the ions formed are negative, because they have more electrons than protons

the ions formed have full outer shells

forming ionic bonds - Positively charged ions are called cations, and negatively charged ions are called anions. These ions can form when a metal reacts with a non-metal, by transferring electrons. The oppositely charged ions are strongly attracted to each other, forming ionic bonds.

why are Hazard symbols important ?

indicate the dangers associated with the substance inside

give information about how to work safely with the substance in the laboratory

what is evaluating risks -

the way the hazard causes harm

how likely it is that someone or something will be exposed to the hazard

how serious the effects of the hazard could b