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.

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answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.