Directions: Read and analyze the sentences carefully. Choose and write the letter of the correct answer in your answer sheet.
___1. What is atomic mass of an element with 40 protons, 40 electrons and 46 neutrons?
a. 6 b. 4 c. 3 d. 7
___2. Based on this illustration, what is the atomic number of this atomic?
a. 1 b. 4 c. 3 d. 7
___3. The atomic mass is equal to____________
a. The number of neutrons only b. The total number of protons and neutrons c. The number of protons only d. The total number of protons, neutrons and electrons
___4. The number in the upper corner of an element tile ( 7 for nitrogen) is called_________
a. The mass number b. The electron number c. The proton number d. The atomic number
___5. For an atom to be electrically neutral, it must contain the same number of________
a. Neutrons and electrons b. Protons and neutrons c. Protons and electrons d. Neutron and atomic
___6. In the Bohr model of an atom, what is the maximum number of electrons in the first shell?
a. 1 b. 6 c. 2 d. 8
___7. How many protons does this element Calcium (Ca) has?
a. 40 b. 21 c. 20 d. 41
___8. If an atom has 24 protons and 24 electrons, what is the atomic number of this element?
a. 0 b. 42 c. 24 d. 48
___9. What gives an atom a mass?
a. Protons and electrons in the nucleus b. Electrons in the clouds c. Protons and neutrons in the nucleus d. Electrons and neutrons in the nucleus
