Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

From the given options, Neon and Argon are considered as noble gases.

Options B and C

Explanation :

All elements present in the Group Zero usually considered as noble gases. Also referred as rare or inert gases. Because researchers trusted that they are incapable to react with all other elements.

The elements are neon (Ne), helium, radon (Rn), xenon (Xe), krypton (Kr), and argon (Ar).  Argon and Neon are the elements that have atoms with eight electrons in their outermost orbits.

Hence, they don’t interact or react with other existing elements and are considered as noble gases, existing in the gaseous state of matter.

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s