01. Electron Theory. Question Number. 1. A neutron has. Option A. the opposite charge to an Electron but half the weight of a proton. Option B. the same charge as an Electron but half the mass. Option C. no electrical charge but will add weight to the nucleus. Correct Answer is. no electrical charge but will add weight to the nucleus. Explanation. NIL. Question Number. 2. The unit which consists of two or more different types of atoms (nguyên tử) is known as a. Option A. particle of an element. (hạt của nguyên tố) Option B. molecule of a compound. (phân tử của 1 hợp chất) Option C. molecule of an element. (phân tử của 1 nguyên tố) Correct Answer is. molecule of a compound. Explanation. NIL. Question Number. 3. In what equipment is a photon radiated when an electron leaves a hole?. Option A. Photocell. Option B. LED. Option C. Photo diode. Correct Answer is. LED. Explanation. NIL. Question Number. 4. A good electrical insulating material will contain. Option A. Only a small number of electrons in the outer shell of each atom of the material. Option B. strongly bound electrons in the atoms of the material. Option C. Weakly bound free electrons in the atoms of the material. Correct Answer is. strongly bound electrons in the atoms of the material. Explanation. NIL. Question Number. 5. The smallest particle that a substance can be split (tách ra) and show the same properties as the whole is known as. Option A. an Element. (nguyên tố Option B. a Molecule. Phân tử Option C. an Atom. Nguyên tử Correct Answer is. an Atom. Explanation. NIL. Question Number. 6. What charge does the nucleus (bao gồm proton+ và notron~ , nên nó sẽ tích điện dương) of an atom possess?. Option A. Positive. Option B. Neutral. Option C. Negative. Correct Answer is. Positive. Explanation. NIL. Question Number. 7. What is the maximum number of electrons in shell N of an atom?. (K L M N O P Q~1 2 3 4 5 6 7 Option A. 18. Option B. 32. 2N2 Option C. 16. Correct Answer is. 32. Explanation. Shell k = 2 electrons, shell L= 8 electrons, shell M = 18 electrons and shell N = 32 electrons (or use the 2n2 exclusion rule). Question Number. 8. An oxygen molecule (PHÂN TỬ) is made up of. Option A. two oxygen atoms sharing neutrons. Option B. two oxygen atoms sharing protons. Option C. two oxygen atoms sharing electrons. Correct Answer is. two oxygen atoms sharing electrons. Explanation. NIL. Question Number. 9. If electrons are added to an atom it becomes. Option A. a neutral ion. Option B. a positive ion. Option C. a negative ion. Correct Answer is. a negative ion. Explanation. NIL. Question Number. 10. An element whose atoms have fewer than 4 electrons in their valency shell are. Option A. semiconductors. Option B. good insulators. Option C. good conductors. Correct Answer is. good conductors. Explanation. The further away from a complete shell the better a conductor it is. Question Number. 11. The charge on a proton is. Option A. positive. Option B. negative. Option C. neutral. Correct Answer is. positive. Explanation. NIL.