The elements that have the most similar chemical properties are [tex]\boxed{{\text{B}}{\text{. Mg, Sr, Ba}}}[/tex].
Further Explanation:
Periodic table:
Elements are arranged in increasing order of their atomic numbers in various rows and columns. Such tabular arrangement is called a periodic table. The elements with the same chemical and physical properties lie in the same group. Horizontal rows are called periods and vertical columns are called groups. There are 18 groups and 7 periods in a periodic table.
Elements are also classified as metals, non-metals, and metalloids in this table. The elements placed at the left side of the table are metals while those placed at the right of the table are non-metals. Metalloids are elements that are placed between metals and non-metals.
Magnesium, strontium, and barium belong to group 2A of the periodic table. These have two valence electrons in their outermost shell. So these three elements have similar chemical properties. But the other given elements do not lie in same group so they have different chemical properties.
Therefore option B is the correct answer.
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Answer details:
Grade: High School
Subject: Chemistry
Chapter: Periodic classification of elements
Keywords: magnesium, strontium, barium, Mg, Ba, Sr, periodic table, elements, group, period, chemical properties, similar.