** ANSWER IS A** As you move from left to right across Period 3, which statement is true of the number of valence electrons as you move from one main-group element to the next?
A. The number of valence electrons increases by 1.
B. The number of valence electrons decreases by 1.
C. The number of valence electrons increases by a multiple of 2.
D. The number of valence electrons decreases by a multiple of 2.

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

Acombination reaction is when two or more combine to form one product. a decomposition reaction is when a substance breaks down into two or more simpler substances in a chemical reaction.

An electric clothes dryer has a resistance of 8 ohms. it draws 30 a of current. what is the voltage, in volts, of the wall outlet that it is plugged into?