Please help lol asap Disregarding the transition metals, what happens to the number of valence electrons as you move from group 1 to group 18 on the periodic table?

A. The number of valence electrons increases in a predictable sequence
B. The number of valence electrons decreases in a predictable sequence
C. The number of valence electrons increases then decreases and increases again in a predictable sequence
D. The number of valence electrons decreases then increases in a predictable sequence

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

Uppose we consider the system of the three capacitors as a single "equivalent" capacitor. given the charges of the three individual capacitors calculated in the previous part, find the total charge qtot for this equivalent capacitor. express your answer in terms of v and c.

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".