Chemistry
Grade-9
Easy
Question
How many neutrons are in this element?
- 79
- 197
- 118
- Cannot be determined
Hint:
Atomic mass = number of neutron + atomic number.
The correct answer is: 118
- Each element is represented in the form AXZ. A is atomic mass, Z is atomic number and X represents the element.
- Here in 19779Au, 197 is atomic mass and 79 is atomic number.
- Atomic mass = number of neutron + atomic number.
Number of neutron = 197-79 = 118.
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