What happens to the number of outermost electrons as you move across a period? a. as you move across a period, the number of outermost electrons decreases. b. as you move across a period, the number of outermost electrons becomes more positive. c. as you move across a period, the number of outermost electrons increases. d. as you move across a period, the number of outermost electrons remains the same.

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change. when the temperature in a room increases from 25°c to 33°c, changes from a solid to a liquid. in a lab, methane and nitrogen are cooled from -170°c to -200°c. the methane freezes and the nitrogen . when gold is heated to 2,856°c it changes from a liquid to a .

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false