Question

3. Complete the table below.

Symbol Atomic
Number
Na
Cl
Ar
Ca
11
20
Mass
Number
36
40
Number of
Protons
17
Number of Number of
Electrons
Neutrons
18
12
18

Answer 1

Step-by-step explanation:

Elements Atomic No. Mass No. Proton No. Electron No. Neutron No.
Na 11 23 11 11 12


Cl 17 35 17 17 18


Ar 18 36 18 18 18


Ca 20 40 20 20 20


Atomic number = Proton number
Electron number = proton number
Mass Number = proton no. + neutron no.
Neutron number = Mass no. - proton no.