Structure Of The Atom Question Preview (ID: 53469)


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(Z = 12, A = 24)Mg and (Z = 12, A = 25)X have the:
a) Same atomic mass
b) Same nuclear charge
c) Same number of neutrons
d)

Isotopes have:
a) Same number of nucleons
b) Same number of neutrons
c) Same number of protons
d)

The average atomic mass of magnesium – 24 and magnesium – 25 is:
a) Less than 24 u
b) Between 24 u and 25 u
c) More than 25 u
d)

The number of neutrons of a chlorine atom that has 17 protons, 17 electrons and 37 nucleons is:
a) 17
b) 20
c) 37
d)

The mass number of a magnesium atom that has 12 protons, 12 electrons and 25 nucleons is:
a) 12
b) 13
c) 25
d)

The atomic mass of an oxygen atom that has 8 protons and 8 neutrons is:
a) 6 u
b) 8 u
c) 14 u
d)

The charge of the electron cloud of the element potassium (Z =19, A =39)K is:
a) 19 -
b) 20 -
c) 39 -
d)

The charge of nucleus of the element argon (Z = 18, A = 38)Ar is:
a) 38+
b) 20+
c) 18+
d)

The atomic number of the element magnesium (Z = 12, A = 25)Mg is
a) 12
b) 13
c) 25
d)

(Z = 13, A = 27)X and (Z = 14, A = 28)Y have the:
a) Same atomic mass
b) Same nuclear charge
c) Same number of neutrons
d)

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