Lithium forms a +1 ion because it loses one electron, making the ratio of electrons:protons unbalanced by losing one electron. the ratio is now 2e:3p.
Oxygen forms a -2 ion because of a different reason. It gains 2 electrons rather than losing them.
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Usually, the cells are round, elongated or spherical. There are also some cells which are long and pointed on both the ends. Such cells exhibit spindle shape. In some cases, the cells are very long.
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i would say the last one Heat energy from below the ground converts water to steam to drive a steam turbine attached to an electrical generator
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