Instruction: Read the questions carefully then choose the letter of the correct answer. Write the letter of your
choice on the space provided before each number.
1. Which of the following refers to the number of protons in the nucleus of the atom?
A. atomic number C. mass number
B. group number D. period number
2. Which of the following gives the mass number of an element?
A. number of electrons C. number of neutrons
B. number of protons D. total number of protons and neutrons
3. Which of the following describes Group VIIA elements?
A. alkali metals
C. alkaline earth metals
B. Halogens
D. Noble gases
4. Aluminum belongs to group IIIA, period 3. The valence electron of Aluminum is__?
A. 4
B. 3
C. 2
D. 1
5. The electron configuration of Neon is 1s 2s 2pº. The valence electron of Neon is ?
A.4
B. 6
C. 8
D. 10
6. The electron configuration of Manganese isls? 2s 2p 3s 3pº4s 3d". The valence electrons of
Manganese is __?
A. 4
B. 6 C. 2
D. 8
7. Which of the following is the valence electrons of calcium (atomic number=20)?
A. 2
B. 6
C.4
D.20
8. Which of the following alkali metals is the most reactive?
B. 19K
C.37Rb
D. 55Cs
9. Which of the following Halogens is the most reactive?
A.°F
B.CI
C.35Br
D.531
10. The noble gases are stable of its
A. valence electron of 2 B. valence electron of 6 C. valence electron of 8 D. valence
electron of 4
11. Element X belongs to group 1. Which of the following best describes element X?
A. high electronegativity B. high ionization energy C. low electronegativity D. a non-metallic
element
12. Atoms react to form chemical bonds because_?
A. to attain stability B.to form compounds C. to form molecules D. to produce ions
13. The number of electrons in the outermost shell corresponds to it__?
A. Valence electrons
B. Ions
C. Covalent electrons D. Ionic electrons
14. Which of following numbers is equivalent to valence shell?
A. group no. B. period no. C. highest energy level occupied
D. atomic no.
15. Which of following numbers is equivalent to valence electron?
A group no.
B. period no C. highest energy level occupied D. orbitals
16. What is the SI unit for measurement of number of particles in a substance?
A. kilogram B. ampere C. candela D. mole
17. Which of the following is NOT a representative particle?
A. molecule B. anion
C. cation
D. electron
18. Which of the following elements exists as a diatomic molecule?
A. neon B. aluminum C. lithium
D. nitrogen
19. Avogadro's number of representative particles is equal to one
A. liter
B. kelvin
C. mole
D. gram
20. Which orbital designation has the highest energy?
A.2s B.2p C.3d D. 4s​