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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The atomic number of this Na is
- 23
- 11
- 22
- 16
The atomic number of this Na is
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- 23
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- 22
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What does in
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In the representation
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What does in
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How many groups are there in the modern periodic table?
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Which one is correct about Mendeleev's periodic law?
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Which one is correct about Mendeleev's periodic law?
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Elements in the same group have __________.
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Elements in the same group have __________.
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The vertical rows on the periodic table are called ___________.

- Periods
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The vertical rows on the periodic table are called ___________.

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Identify number 16 on the periodic table square below.

- Atomic mass
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Identify number 16 on the periodic table square below.

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This group of elements sit along a stair step line on the periodic table and have properties of both metals and non-metals:
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This group of elements sit along a stair step line on the periodic table and have properties of both metals and non-metals:
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- Atomic mass
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Identify number 14 on the periodic table square below.

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