scientists plan to place detection devices outside earth's atmosphere to detect radiations from a star. which of the following best explains the type of detection device that the scientists would use?
a radar, because high frequency microwaves are limited to the region outside earth's atmosphere
special cameras, because high frequency uv rays are emitted by objects at very high temperatures
special cameras, because high energy uv rays are emitted by objects having very high mass
a radar, because high energy microwaves are produced from very hot objects

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

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.