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12) SEP Use Mathematics Complete the table by identifying the atomic number and
mass number for each atom and then using those data to determine the numbers
of protons, neutrons, and electrons.
Composition of Atoms
Atom
Atomic number
Mass number
Protons
Electrons
Neutrons
Na
2s
silver-108
47
T
gold-197
79
O
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Answer :

The given elements are Na, Ag and Au.

1. Sodium(Na)

Mass number= 23 u

Atomic number=11

Number of protons= Number of electrons= Atomic number=11

Number of neutrons= Mass number- Number of protons=23-11=12

2. Silver (Ag)

Mass number= 108 u

Atomic number= 47

Number of protons= Number of electrons= Atomic number= 47

Number of neutrons= Mass number- Number of protons=108-47=61

3. Gold (Au)

Mass number= 197 u

Atomic number= 79

Number of protons= Number of electrons= Atomic number= 79

Number of neutrons= Mass number- Number of protons= 197-79=118

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