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what is the transit of venus?

a. when the orbit of venus crosses the orbit of earth

b.) when venus can be seen from earth and appears to be shaded by the moon

c. when venus can be seen from earth and appears to shade the sun

d. ) when venus can be seen from earth and appears to trace a path across the face of the sun

A transit of Venus across the Sun takes place when the planet Venus passes directly between the Sun and a superior planet, becoming visible against (and hence obscuring a small portion of) the solar disk. ... Transits of Venus are among the rarest of predictable astronomical phenomena.

Explanation:

it's c. elements are placed in rows based on how may valencies electrons have.