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ATOMS

publish date: 2026/02/18 15:19:00 UTC

An atom is composed of protons, neutrons, and electrons.  A proton has a positive charge (represented by +1), a nuetron has no charge, and an electron has a negative chare (-1).  Two simple models of atoms are shown below.

  1. How many protons does the atom in the figure (a)? (1) How many electrons? (2)
  2. What is the net charge of the atom in figure (a)? (3)
  3. How many protons does the atom in figure (b) have? (4) How many electrons? (5)
  4. What is the net charge of the atom in figure (b)? (6)

Correct Answer

(1) 8
(2) 10
(3) -2
(4) 4
(5) 4
(6) 0

Explanation

Atom a has

  1. 8 protons
  2. 10 electrons
  3. The net charge is 8 + (-10) = -2

Atom b has

  1. 4 protons
  2. 4 electrons
  3. The net charge is 4 + (-4) = 0

Reference

Mathematics for college students, go-math-science.com

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