Atoms of o-16, o-17,o-18 have the same number of neutrons?

The number of neutrons are different.

Explanation: -

In 17O

The mass number is 17

The atomic number for oxygen = 8

Number of neutrons of 17O = Mass number of 17O – atomic number

= 17-8

=9

In 16O

The mass number is 16

Number of neutrons of 16O = Mass number of 16O – atomic number

= 16-8

=8

The mass number is 18

The atomic number for oxygen = 8

Number of neutrons of 18O = Mass number of 18O – atomic number

= 18-8

=10

As we can see the number of neutrons are different in each case.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e