Structure Of Matter Question Preview (ID: 53471)
It Is A Test For Grade 8 Students.
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The number of protons of the element sodium (Z = 11, A = 23)Na is:
a) 11
b) 12
c) 23
d)
The number of neutrons of the element neon (Z = 10, A = 20)Ne is:
a) 30
b) 20
c) 10
d)
The number of electrons of the element potassium (Z = 19, A = 39)K is:
a) 39
b) 19
c) 20
d)
The atomic number of an oxygen atom that has 16 nucleons and 8 neutrons is:
a) 8
b) 16
c) 24
d)
The mass number of a magnesium atom that has 12 protons, 12 electrons and 13 neutrons is:
a) 12
b) 13
c) 25
d)
The number of neutrons of a fluorine atom that has 9 protons, 9 electrons and 19 nucleons is:
a) 9
b) 10
c) 19
d)
The fluorine atom (Z = 9, A =19)F contains:
a) 9 p, 9 e 9 n
b) 9 p, 19 e 9 n
c) 9 p, 9 e 10 n
d)
Isotopes have:
a) Same number of nucleons
b) Same number of electrons
c) Same number of neutrons
d)
(Z = 12, A = 25)Mg and (Z = 13, A = 25)X have the:
a) Same mass number
b) Same atomic number
c) Same number of neutrons
d)
(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
d)
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