11. Which statement about subatomic particles is TRUE?
A. Protons, Electrons, and Neutrons all have the same mass C. Unlike protons or neutrons, electrons have no mass
B. An electron has less mass than either a proton or neutron D. Neutrons have no charge and no mass
12. The mass number of the atom can be obtained by
A. Adding the protons and the electrons
C. Determining the number of protons only
B. Adding the electrons and neutrons
D. Adding the number of protons and neutrons
13. The atomic number of an element is equal to
A. The number of protons in an atom
C. The number of protons plus the number of electrons in the atom
B. The number of neutrons in an atom
D. The number of protons plus the number of neutrons in the atom
14. To determine the number of neutrons in the nucleus of a neutral atom, you have to subtract
A. Its mass number from its atomic number
C. Its mass number from its electron number
B. Its atomic number from its mass number
D. Its atomic number by its electron number
15. The identity of an element is determined by
A. The number of its protons B. The number of its neutrons C. Its atomic mass D. The number of its electrons
16. Which of the three subatomic particles have the least contribution to the overall mass of an atom?
A Proton
B. Neutron
C. Electron D. Nucleus
17. Hydrogen has an atomic number of 1 and a mass number of 1. Which is NOT true about hydrogen?
A. It has 1 proton
B. It has 1 electron
C. It has 1 neutron D. It is electrically neutral
18. The element oxygen (O) has an atomic number of 8. How many number of protons are there in an oxygen atom?
A. 8
B. 16
C.32
D. 64
19. The element Neon (Ne) has an atomic number of 10. How many number of Electrons are in a Neon atom?
A. O
B.5
C. 10
D. 15
20. The element Calcium has a mass number of 40 and an atomic number of 20. What is its number of Neutron?
A.5
B. 10
C. 15
D. 20
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Answer:
11. D
12. A
13. D
14. B
15. B
16. C
17. A
18. C
19. A
20. B
Explanation:
Correct me if im wrong