What is a unique characteristic of covalent bonding between nonmetal atoms a) atoms give away electrons to reach a stable octet
b)atoms share valence electrons with neighboring atoms to reach a stable octect.
c)atoms gain electrons to reach a stable octet
d)delocalized electrons move freely among many positive atoms creating a ''sea'' of electrons

Construct the hypothetical phase diagram for metals a and b between room temperature (20c) and 700c, given the following information: * the melting temperature of metal a is 480c. • the maximum solubility of b in a is 4 wt% b, which occurs at 420c. • the solubility of b in a at room temperature is 0 wt% b. • one eutectic occurs at 420c and 18 wt% b–82 wt% a. • a second eutectic occurs at 475c and 42 wt% b–58 wt% a. • the intermetallic compound ab exists at a composition of 30 wt% b–70 wt% a, and melts congruently at 525c.• the melting temperature of metal b is 600c. • the maximum solubility of a in b is 13 wt% a, which occurs at 475c. • the solubility of a in b at room temperature is 3 wt% a.

In a copper wire, a temperature increase is the result of which of the following

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory