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Questions and Answers
How many elements are there in the periodic table?
How many elements are there in the periodic table?
- 64
- 118 (correct)
- 92
- 30
What is the atomic number of the last element in the first 30 elements of the periodic table?
What is the atomic number of the last element in the first 30 elements of the periodic table?
- 28
- 30 (correct)
- 20
- 18
Which element is the lightest among the first 30 elements on the periodic table?
Which element is the lightest among the first 30 elements on the periodic table?
- Oxygen
- Sodium
- Lithium (correct)
- Boron
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Study Notes
Periodic Table Overview
- There are 118 known elements in the periodic table.
Atomic Number of the Last Element in the First 30 Elements
- The atomic number of the last element in the first 30 elements of the periodic table is 30, which corresponds to Zinc (Zn).
Lightest Element Among the First 30 Elements
- Hydrogen (H) is the lightest element among the first 30 elements on the periodic table, with an atomic mass of 1.008 u (unified atomic mass units).
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