There are three stable forms of neon: neon-20, neon-21, and neon-22. Which statement is true - the atomic mass of the three isotopes is the same
-the three isotopes are all radioactive
-the three isotopes are equally abundant in nature
-the charge of all isotopes is the same

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.