Question 13 — Complete the Table 8.5 - Questions at the end of the chapter - Chapter 8 - Journey Inside the Atom (Exploration)

Last updated at July 3, 2026 by

Question 13
Complete the Table 8.5 by writing the missing values in each row.
Atomic number Mass number Number of neutrons Number of protons Number of electrons Name of the elements
5 11 6 5 5 Boron
7 14 7 7 7 Nitrogen
12 24 12 12 12 Magnesium
15 31 16 15 15 Phosphorus
1 1 0 1 1 Hydrogen
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Atomic number Mass number Neutrons Protons Electrons Element
5 11 6 5 5 Boron
7 14 7 7 7 Nitrogen
12 24 12 12 12 Magnesium
15 31 16 15 15 Phosphorus
1 1 0 1 1 Hydrogen

Use Z = protons = electrons, A = protons + neutrons, and neutrons = A − Z.

Using the Table Atomic number equals number of protons Mass number equals protons plus neutrons Neutrons equal A minus Z Protons equal electrons (neutral atom)
Back to: 8.6 Mass Number
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