Based on periodic trends of electronegativity, what statement regarding the halogens is most accurate? a) flourine has the lowest electronegativity. b) iodine has the strongest tendency to attract electrons. c) fluorine has the strongest tendency to attract electrons. d) because of it's low electronegativity, iodine does not readily form compounds.

If I remember correctly the answer would be C.  Electronegativity increases going right from the Alkali Metals to the Noble Gasses with the gasses being the strongest.  Also going up from Ununoctium up to Helium.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied