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Atomi Model Test

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COMPREHENSION EXERCISE Subject : Chemistry Matter : Atomic Model’s and Sub Atomic Particles Class/Grade : X/1 Packet : 03 I. Give a cross mark(X) on a, b, c, d or e for the correct answer.
1. An atomic-level species is found to contain 16 protons, 16 neutrons and 18 electrons. This species is best described as
A. an atom of sulphur (S) D. a cation of sulphur
B. an isotope of sulphur E. an isobar of sulphur
C. an anion of sulphur
2. A species has 20 neutrons, 17 protons and 18 electrons. Which one of the following statements is correct?
A. It is a calcium ion, Ca+2 D. It is a sulphide ion, S2–
B. It is a chloride ion, Cl– E. It is a neutral atom carbon, C
C. It is a neutral atom of argon, Ar.
3. An atom of a certain element has mass number of 200 and the number of neutron of that atom is 120, so the number of protons is………
A. 120 B. 200 C. 80 D. 320 E. 220
4. An ion symbolized as 40 X 20 +2, and then the ion placed on group…..
A. VII A B. IV A C. II A D. IV B E. IIB
5. Sulphur is symbolized as 32S16, and then ion of S-2 has the number of electrons of …..
A. 32 B. 16 C. 18 D. 14 E. 34
6. The element having the atomic number of 35 placed on period………
A. 5 B. 7 C. 3 D. 1 E. 6
7. An element has the electron configuration of 2, 8, 8, 3. The following are the true statement according to the element, except….
A. The element placed at 4-th period
B. The element have the valence electron of 3
C. The valence electron of the element placed at the N shell
D. The element placed at 3-th period
E. The element placed at group IIIA
8. An element has the relative atomic mass of 28 and electron configuration of 2, 8, 4. The wrong statement about the elements is….
A. The atomic number is 14
B. The number of electron is 28
C. The number of valence electron is 2
D. The

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