Use the drop-down menus to indicate the stage of technological design in which each action would occur. Establish criteria and prepare the initial design.
Redesign and retest as necessary.
Define a need and research related information.
Build and test a prototype.

Match each object to its description: a. coma of a comet b. comet tail c. oort cloud haze surrounding a nucleus created by solar wind. hypothetical sphere around the solar system

What does x represent in the formula for the compound xcl4?

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.