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Structure Of Matter
Test Description: It is a test for grade 8 students
Instructions: Answer all questions to get your test result.
1) The number of protons of the element sodium (Z = 11, A = 23)Na is:
A
11
B
12
C
23
2) The number of neutrons of the element neon (Z = 10, A = 20)Ne is:
A
20
B
10
C
30
3) The number of electrons of the element potassium (Z = 19, A = 39)K is:
A
19
B
39
C
20
4) The atomic number of an oxygen atom that has 16 nucleons and 8 neutrons is:
A
16
B
8
C
24
5) The mass number of a magnesium atom that has 12 protons, 12 electrons and 13 neutrons is:
A
13
B
25
C
12
6) The number of neutrons of a fluorine atom that has 9 protons, 9 electrons and 19 nucleons is:
A
9
B
19
C
10
7) The fluorine atom (Z = 9, A =19)F contains:
A
9 p, 9 e 10 n
B
9 p, 19 e 9 n
C
9 p, 9 e 9 n
8) Isotopes have:
A
Same number of nucleons
B
Same number of electrons
C
Same number of neutrons
9) (Z = 12, A = 25)Mg and (Z = 13, A = 25)X have the:
A
Same atomic number
B
Same number of neutrons
C
Same mass number
10) (Z= 14, A = 27)X and (Z = 14, A = 28)X have the:
A
Same mass number
B
Same atomic number
C
Same number of neutrons
*select an answer for all questions
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