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Structure Of The Atom
Test Description: It is a quiz for grade 9 students
Instructions: Answer all questions to get your test result.
1) The atomic number of the element magnesium (Z = 12, A = 25)Mg is
A
12
B
25
C
13
2) The charge of nucleus of the element argon (Z = 18, A = 38)Ar is:
A
38+
B
20+
C
18+
3) The charge of the electron cloud of the element potassium (Z =19, A =39)K is:
A
39 -
B
20 -
C
19 -
4) The atomic mass of an oxygen atom that has 8 protons and 8 neutrons is:
A
8 u
B
14 u
C
6 u
5) The mass number of a magnesium atom that has 12 protons, 12 electrons and 25 nucleons is:
A
12
B
25
C
13
6) The number of neutrons of a chlorine atom that has 17 protons, 17 electrons and 37 nucleons is:
A
17
B
37
C
20
7) The average atomic mass of magnesium – 24 and magnesium – 25 is:
A
Between 24 u and 25 u
B
Less than 24 u
C
More than 25 u
8) Isotopes have:
A
Same number of protons
B
Same number of neutrons
C
Same number of nucleons
9) (Z = 12, A = 24)Mg and (Z = 12, A = 25)X have the:
A
Same number of neutrons
B
Same atomic mass
C
Same nuclear charge
10) (Z = 13, A = 27)X and (Z = 14, A = 28)Y have the:
A
Same number of neutrons
B
Same atomic mass
C
Same nuclear charge
*select an answer for all questions
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