Which set of atoms have 3 valence electrons? A. Hydrogen, lithium, and sodium
B. Boron, aluminum, and gallium
C. Beryllium, magnesium, and calcium
D. Carbon, silicon, and germanium

Janelle made a hypothesis bout the uneven temperatures inside her house during winter. she believes that 50% of the ducts are blocked and she plans to investigate. if she wants to prove her hypothesis using scientific processes what should she do next?

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

In a system, when potential energy decreases, then entropy also decreases. true false