1. Atoms are neutral. The number of protons in the nucleus is equal to the number of _______.
A. Proton
B. All of the above
C. Neutron
D. Electron

2. Mass number is equal to the combined number of all protons and _______ in the atom.
A. Electrons
B. Neutrons
C. Protons
D. None of the above

3. The number of each subatomic particle of the element can be easily identified if we know the mass number and the atomic number. The atomic number is equal to the number of ______.
A. Electron
B. Neutron
C. Proton
D. Proton and Neutron

4. Refer to the periodic table. How many protons does the Phosphorus have?
A. 10
B. 12
C. 15
D. 18

5. The number of neutrons in an atom of magnesium is _____.
A. 19
B. 10
C. 12
D. 24

6. A/n _____ is an ion with a positive (+) charge.
A. Anion
B. Cation
C. Charge
D. Ion

7. What is the charge of Rubídium found in group 1A?
A. 1+
B. 2+
C. 3+
D. 4+

8. What ion has 18 electrons, 19 protons and 20 neutrons?
A. K+1 (Pótassium ion)
B. Mg+2 (Magnesium ion)
C. Na+1 (Sodium ion)
D. Ca+2 (Calcium ion)

9. Which atom would produce a cation?
A. Ba
B. Br
C. Cl
D. Kr

10. If an atom of 47 Silver has a charge of +1, how many electrons does the atom have?
A. 46
B. 47
C. 48
D. 49

11. An atom becomes _____ when it gains electrons.
A. Indivicible
B. Negative
C. Neutral
D. Positive

12. All statements are true EXCEPT:
A. An isotope is any of the two or more atoms of an element having the same atomic mass but different atomic number.
B. Mass number is the total number of protons and neutrons in an atom.
C. The number of protons in an atom is the atomic number.
D. Mass number is equal to atomic number.

13. How many electrons, protons and neutrons are present in 34 atomic number, 80 mass number, Se2-?
A. 34 electrons, 34 protons, 46 neutrons
B. 36 electrons, 34 protons, 46 neutrons
C. 36 electrons, 36 protons, 46 neutrons
D. 34 electrons, 36 protons, 46 neutrons

14. What is common among or to the following species: N3-, O2-, Na+ and Mg2+?
A. Mass number
B. Number of protons
C. Number of electrons
D. Number of neutrons

15. Anions are ____ that form _____ ions and _____ electrons.
A. Nonmetals, negative, gain
B. Nonmetals, positive, lose
C. Metals, positive, gain
D. Metals, positive, lose

17. What would be the number of electrons of Cu2+ if its atomic no. is 29?
A. 27
B. 28
C. 29
D. 31

18. What is the number of electrons of O2-if its atomic number is 8?
A. 8
B. 10
C. 11
D. 12

19. Which of the following subatomic particles is numerically equal to the atomic number?
A. electron
B. neutron
C. proton
D. proton and neutron

20. Atomic mass could be determined by _______.
A. neutron
B. proton
C. electron
D. proton and neutron

21. What will happen to the number of electrons if the charge of the atom is negative?
A. decrease
B. increase
C. remains the same
D. either increase or decrease

25. Aluminum has an atomic number of 13 and atomic mass of 27. Which of the following sets of proton, electrons and neutron is correct for aluminum after losing of 3 electrons?
A. 13, 13, 14
B. 13, 10, 14
C. 13, 13, 27
D. 13, 14, 2​