Chemistry
Grade-9
Easy
Question
Which sort of substances are included in the Periodic Table?
- Elements
- Electrons
- Neutrons
- Compounds
Hint:
There are 118 elements in periodic table.
The correct answer is: Elements
- In Mendeleev's periodic table there are 118 elements arranged in 18 groups and 7 periods.
- Mass number = number of protons + atomic number.
- Neutrons are subatomic particle.
- Compounds are composition of two or more elements.
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