Two highly reactive elements in period 2 are the metal lithium an the A)metaloid
B)nonmetal selenium
C)nonmetal fluoride
D)nonmetal krypton

Fluoride it’s a halogen and they tend be highly reactive

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

B"hf and f-"  is the correct answer took the test on edgenuity and got it right