To determine which of the listed properties are displayed in the periodic table, it’s important to understand the general features and information typically provided in periodic tables.
The periodic table generally provides the following information for each element:
1. Atomic Number (I): This is the number of protons in the nucleus of an atom. It is a unique identifier for each element and is always displayed in the periodic table.
2. Average Atomic Mass (II): This is the weighted average mass of the atoms in a naturally occurring sample of the element. It takes into account the relative abundance of different isotopes of an element. This value is typically displayed on the periodic table.
3. Mass Number (III): This is the total number of protons and neutrons in the nucleus of an atom. While it is a significant quantity, it is not commonly displayed on standard periodic tables because it can vary between isotopes.
4. Actual Atomic Mass (IV): This is a precise measurement of the mass of a specific atom, usually obtained through experimental methods. It is not typically displayed on the periodic table.
From this explanation, it is clear that the standard periodic table normally displays items I (Atomic Number) and II (Average Atomic Mass).
Therefore, the correct combination that answers the question is:
I and II
Hence, the answer is:
OI and II
