Question

A. How do the numbers of protons in different isotopes of an element compare?

b. How do the number of neutrons in different isotopes of an element compare?

c. What is the atomic number of an atom, and where can you find it on the periodic table?

d. How many protons, neutrons and electrons does a neutral atom of iron-55 have?

Answer 1

a) Protons define an element, so all isotopes have the same number of protons.

b) And what really differs is a number of neutrons.

c) The atomic number equals number of electrons or positrons and is written on the left side below the atom.

d) 26 protons & electrons, 29 neutrons.

Answer 2

PART A)

In isotopes number of protons will be same in two.

So there is no difference in number of protons

PART B)

Number of neutrons will be different in two isotopes

it may be greater or less than by one

So two isotopes are of different number of neutrons

PART C)

Atomic number of atom is written in subscript of an atom

It is written below the atom

It shows the total number of protons or electrons in an atom

`_Z^AX` in this presentation z = number of protons

PART D)

iron-55 shows that it has number of protons + neutron = 55

As we know that atomic number of iron is 26

so number of protons = 26

now number of neutrons = 55 - 26 = 29

number of electrons = number of protons = 26