Question

What will be the difference in mass number if number of neutrons is halved and the number of electrons is doubled in 0?

Answer 1

the mass no.will be reduced by25% as it depends on no.of protons+neutrons.it does not depend on what the no.of electrons are.

Answer 2

Answer:

In the given question, we are asked to find the difference between the original and new mass numbers after we apply some conditions on Oxygen atom.

Explanation:

We know that Oxygen in chemistry is denoted as ₈O¹⁶, where, 16 = mass number of oxygen and 8 = number of protons = number of electrons in oxygen.

Now, we know that:

Mass number of an element = number of protons/electrons + number of neutrons in that element.

Hence, number of neutrons = Mass number of an element - number of protons/electrons.

Therefore, number of neutrons in an oxygen atom = 16-8 = 8

Now, when the number of neutrons is halved, it becomes = 8/2 = 4

When number of electrons or protons is doubled, it becomes = 8×2 = 16

Therefore, new mass number = 16 + 4

                                                  = 20

Hence, diffference in mass number of oxygen would be = 20-16 = 4.