Answer: A) Sodium Na and Magnesium Mg
Explanation:
In the period table, you can see that Sodium (group 1) has 11 protons, and Magnesium (group 2) has 12 protons. 11+12=23 protons
Option A is correct. The atoms of which two elements have a combined total of 23 protons are Sodium and magnesium
The proton of an element is also known as its atomic number.
Given
Total number of protons = 23 protons
We need to find two elements whose atomic numbers sum up to 23.
Atomic number of sodium = 11 (This means that it contains 11 protons)
Atomic number of magnesium = 12
Sum of their atomic number = 11 + 12 = 23
This means that the atoms of which two elements have a combined total of 23 protons are Sodium and magnesium.
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