When was ptolemy born the astronomer

Ptolemy was born 100 AD.

Claudius Ptolemy was a mathematician, astronomer, geographer, and astrologer who wrote about a dozen scientific treatises, three of which were of importance to later Byzantine, Islamic, and Western European science.

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

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explanation:

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