I. MULTIPLE CHOICE

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

___10. How many neutrons does Sodium (Na) have?

a. 11 b. 12 c. 22 d. 23​