Solved: Complete the table.Chemical SymbolAtomic Number (Z)Mass Number (A)# Protons#

Solution 57P :

Step 1:

Here, we have to complete the table :

Atomic number indicates the number of protons and electrons in an unchanged atom. Mass number is the sum of protons and neutrons.

        Atomic number = number of protons = number of electrons.

        Mass number = number of protons + number of neutrons.

Let’s consider 1st row :

Chemical symbol = Tc

Atomic Number (Z) = ?

Mass Number (A) = 95

Number of Protons = ?

Number of Neutrons = ?

Tc is the chemical symbol of element Technetium. It has atomic number of 43.

        Number of protons = 43

        Number of neutrons = Mass number - number of protons

                                 = 95 - 43

                                 = 52