50 Points Which of the following sequences of elements would all have four valence electrons?
B, Si, As, Te

C, Si, Ge, Sn

O, S, Se, Te

Ga, Ge, As, Se

What provides structure to the human body?

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.