Grade 9 Chemistry Question Preview (ID: 53101)
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Mg (Z=12, A=23) and X (Z=12, A=25):
a) Atoms of different elements.
b) Allotropes
c) Isotopes
d)
Isotopes have:
a) The same number of nucleons
b) The same number of neutrons
c) The same number of protons
d)
The mass number of a carbon atom that has 6 protons and 12 nucleons is:
a) 6
b) 12
c) 18
d)
The mass number of a fluorine atom that has 9 protons, 9 electrons and 11 neutrons is:
a) 9
b) 11
c) 20
d)
The atomic number of a sodium atom that has 11 protons, 11 electrons and 12 neutrons is:
a) 11
b) 12
c) 23
d)
The atomic number of an oxygen atom that has 17 nucleons and 9 neutrons is:
a) 8
b) 9
c) 26
d)
The number of neutrons of the element magnesium Mg (Z=12, A=25) is:
a) 12
b) 13
c) 15
d)
The mass number of the element neon Ne (Z=10, A=20) is:
a) 10
b) 20
c) 30
d)
The atomic number of the element calcium Ca (Z=20, A=40) is:
a) 20
b) 40
c) 60
d)
X (Z=13, A=27) and X (Z=14, A=27):
a) Atoms of different elements.
b) Allotropes
c) Isotopes
d)
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