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Topic 3
. - The Atomic Structure

23. Ions: Determining number of particles in ions

1. What is the total number of electrons in S ion?
2-
1) 10 2) 14 3) 16 4) 18

-
2. The total number of electrons in F ion is
1) 9 2) 8 3) 10 4) 17

3+
3. What is the total number of electrons in a Cr ion?
1) 3 2) 21 3) 24 4) 27
2+
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4. The total number of electrons in a Mg ion is
1) 10 2) 2 3) 12 4) 24

5. How many electrons are in a potassium atom with a +1 charge?
1) 18 2) 19 3) 21 4) 1

6. What is the ionic charge of an atom of strontium with 36 electrons?

1) +2 2) -2 3) +38 4) – 36

7. An atom has 16 protons, 17 neutrons and 18 electrons. What is the charge of this atom?
1) +2 2) -1 3) +2 4) -2
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8. An atom has a nuclear charge of 50 and 46 electrons. The net ionic charge of this atom is
1) +46 2) -46 3) -4 4 ) +4

9. An atom contains has a nuclear charge of +7, 10 electrons, and 8 neutrons. What is the ionic charge
of this atom?

1) +7 2) – 1 3) – 3 4) +3
3-
10. The ion P has 3) 18 protons and 15 electrons
1) 15 protons and 15 electrons
2) 15 protons and 18 electrons 4) 18 protons and 18 electrons

11. An atom with a nuclear charge of +14 and an ionic charge of -4 has
1) 14 protons and 18 electrons 3) 14 protons and 4 electrons
2) 14 protons and 14 electrons
4) 4 protons and 14 electrons

4+
12. The ion Mn has
1) 25 protons and 25 electrons 3) 25 protons and 21 electrons
2) 25 protons and 4 electrons 4) 21 protons and 25 electrons

13. Which is true of a sodium ion ( Na ?
+)
1) It has a nuclear charge of +1 and 11 electrons
2) It has a nuclear charge of +11 and 12 electrons
3) It has a nuclear charge of +1 and 10 electrons
4) It has a nuclear charge of +11 and 10 electrons

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