Platinum (Pt) is in the 78th position in the periodic table. A neutral atom of the element that comes just before platinum in the periodic table has (Blank) electrons and (Blank) protons.

c

explanation:

i believe the answer is c and this is only worth 10 points you might wanna change it

that would be b i just took the test : )

explanation:

the masses of the objects and the distance between them

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

read more on -